If your theme was specifically built using the alpha version then you may not be able to update to a newer version.
It looks as though your theme css has been tacked on to the end of the bootstrap alpha css rather than as a custom theme. If it was done properly then you could have just updated the bootstrap css and see what happens. You should never change the original bootstrap files but use a custom css file instead.
I can’t possibly look through all 16,000 lines of code to see if the theme developer has changed the default bootstrap css files or not.
You could try locating the theme css which seems to be at about line 16000 of the un-minified theme.css and looks like this.
html {
scroll-behavior: smooth;
-webkit-overflow-scrolling: smooth;
scroll-padding-top: 6.3125rem;
}
header {
position: relative;
z-index: 1020;
background: #fffefe;
}
body {
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
position: relative;
}
pre,
code {
-webkit-font-smoothing: auto;
-moz-osx-font-smoothing: auto;
}
section {
position: relative;
padding-top: 4rem;
padding-bottom: 4rem;
}
@media (min-width: 992px) {
section {
padding-top: 7.5rem;
padding-bottom: 7.5rem;
}
}
input,
button,
select,
optgroup,
textarea,
label,
.alert,
.badge,
.blockquote-footer,
.btn,
.navbar,
.pagination,
.valid-feedback,
.invalid-feedback {
font-family: "Yantramanav", "Open Sans", -apple-system, BlinkMacSystemFont,
"Segoe UI", "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji",
"Segoe UI Emoji", "Segoe UI Symbol";
}
pre {
margin: 0;
-webkit-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
strong {
font-weight: 600;
}
label {
font-weight: 500 !important;
margin-bottom: 0.5rem;
}
ol,
ul {
padding-left: 1.1rem;
}
.firefox .dropcap:first-letter {
margin-top: 0.175em;
}
.chrome .btn-close {
background-clip: unset;
}
.text-smallcaps {
font-variant: small-caps;
}
.text-superscript {
vertical-align: super;
}
.text-word-break {
word-break: break-word;
}
.font-sans-serif {
font-family: "Yantramanav", "Open Sans", -apple-system, BlinkMacSystemFont,
"Segoe UI", "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji",
"Segoe UI Emoji", "Segoe UI Symbol";
}
.font-base {
font-family: "Yantramanav", -apple-system, BlinkMacSystemFont, "Segoe UI",
"Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
"Segoe UI Symbol";
}
.fs-error {
font-size: 7rem;
}
@media (min-width: 576px) {
.fs-error {
font-size: 10rem;
}
}
.text-justify {
text-align: justify !important;
}
.text-gradient {
background: -o-linear-gradient(40deg, #fb3c00, #ffb800);
background: linear-gradient(50deg, #fb3c00, #ffb800);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
}
.bg-holder {
position: absolute;
width: 100%;
min-height: 100%;
top: 0;
left: 0;
background-size: cover;
background-position: center;
overflow: hidden;
will-change: transform, opacity, filter;
-webkit-backface-visibility: hidden;
backface-visibility: hidden;
background-repeat: no-repeat;
z-index: 0;
}
.bg-holder.bg-right {
left: auto;
right: 0;
}
.bg-holder.overlay:before {
position: absolute;
content: "";
background: rgba(0, 0, 0, 0.25);
top: 0;
bottom: 0;
left: 0;
right: 0;
}
.bg-holder.overlay-0:before {
background: rgba(0, 0, 0, 0.7);
}
.bg-holder.overlay-1:before {
background: rgba(0, 0, 0, 0.55);
}
.bg-holder.overlay-2:before {
background: rgba(0, 0, 0, 0.4);
}
.bg-holder.overlay-light:before {
background: rgba(255, 255, 255, 0.8);
}
.bg-holder .bg-video {
position: absolute;
display: block;
z-index: -1;
top: 0;
left: 0;
-o-object-fit: cover;
object-fit: cover;
height: 100%;
min-width: 100%;
}
.bg-holder .bg-youtube {
position: absolute !important;
top: 0;
left: 0;
height: 100%;
width: 100%;
}
.bg-light-gradient {
background: #ffffff;
opacity: 0.85;
}
.bg-primary-gradient {
background: -webkit-gradient(
linear,
left top,
left bottom,
color-stop(-42.47%, rgba(255, 206, 103, 0.22)),
to(rgba(253, 237, 202, 0))
);
background: -o-linear-gradient(
top,
rgba(255, 206, 103, 0.22) -42.47%,
rgba(253, 237, 202, 0) 100%
);
background: linear-gradient(
180deg,
rgba(255, 206, 103, 0.22) -42.47%,
rgba(253, 237, 202, 0) 100%
);
}
.bg-dark-gradient {
background: -webkit-gradient(
linear,
left bottom,
left top,
from(rgba(33, 33, 33, 0.411)),
to(rgba(33, 33, 33, 0))
);
background: -o-linear-gradient(
bottom,
rgba(33, 33, 33, 0.411) 0%,
rgba(33, 33, 33, 0) 100%
);
background: linear-gradient(
0deg,
rgba(33, 33, 33, 0.411) 0%,
rgba(33, 33, 33, 0) 100%
);
}
.overflow-hidden[class*="rounded"] {
-webkit-mask-image: radial-gradient(#fffefe, #000);
mask-image: radial-gradient(#fffefe, #000);
}
.border-top-2 {
border-top-width: 0.125rem !important;
}
.border-end-2 {
border-right-width: 0.125rem !important;
}
.border-bottom-2 {
border-bottom-width: 0.125rem !important;
}
.border-start-2 {
border-left-width: 0.125rem !important;
}
.hr-vertical {
border-left: 2px solid #cfcfcf;
}
.container,
.container-fluid,
.container-sm,
.container-md,
.container-lg,
.container-xl,
.container-xxl {
position: relative;
}
.all-0 {
top: 0;
right: 0;
bottom: 0;
left: 0;
}
.flex-center {
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
}
.flex-between-center {
-webkit-box-pack: justify;
-ms-flex-pack: justify;
justify-content: space-between;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
}
.flex-end-center {
-webkit-box-pack: end;
-ms-flex-pack: end;
justify-content: flex-end;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
}
.flex-1 {
-webkit-box-flex: 1;
-ms-flex: 1;
flex: 1;
}
.link-black {
color: #000 !important;
}
.link-black:hover,
.link-black:focus {
color: #000 !important;
}
.link-100 {
color: #fcfcfc !important;
}
.link-100:hover,
.link-100:focus {
color: #d6d6d6 !important;
}
.link-200 {
color: #f5f5f5 !important;
}
.link-200:hover,
.link-200:focus {
color: #cfcfcf !important;
}
.link-300 {
color: #eee !important;
}
.link-300:hover,
.link-300:focus {
color: #c8c8c8 !important;
}
.link-400 {
color: #e0e0e0 !important;
}
.link-400:hover,
.link-400:focus {
color: #bababa !important;
}
.link-500 {
color: #bdbdbd !important;
}
.link-500:hover,
.link-500:focus {
color: #979797 !important;
}
.link-600 {
color: #9e9e9e !important;
}
.link-600:hover,
.link-600:focus {
color: #787878 !important;
}
.link-700 {
color: #757575 !important;
}
.link-700:hover,
.link-700:focus {
color: #4f4f4f !important;
}
.link-800 {
color: #616161 !important;
}
.link-800:hover,
.link-800:focus {
color: #3b3b3b !important;
}
.link-900 {
color: #424242 !important;
}
.link-900:hover,
.link-900:focus {
color: #1c1c1c !important;
}
.link-1000 {
color: #23242a !important;
}
.link-1000:hover,
.link-1000:focus {
color: #000 !important;
}
.link-white {
color: #fffefe !important;
}
.link-white:hover,
.link-white:focus {
color: #ffb2b2 !important;
}
.hover-top-shadow {
-webkit-transform: translateY(0) translateZ(0);
transform: translateY(0) translateZ(0);
-webkit-transition: all 0.3s ease-out;
-o-transition: all 0.3s ease-out;
transition: all 0.3s ease-out;
}
.hover-top-shadow.hover-top-shadow-lg:hover,
.hover-top-shadow.hover-top-shadow-lg:focus {
-webkit-transform: translateY(-0.3125rem) translateZ(0);
transform: translateY(-0.3125rem) translateZ(0);
}
.hover-top-shadow:hover,
.hover-top-shadow:focus {
-webkit-transform: translateY(-0.125rem) translateZ(0);
transform: translateY(-0.125rem) translateZ(0);
-webkit-box-shadow: 0 0 0.5rem 0 rgba(255, 201, 40, 0.8) !important;
box-shadow: 0 0 0.5rem 0 rgba(255, 201, 40, 0.8) !important;
}
.shadow-transition {
-webkit-box-shadow: 0 1.5625rem 2.8125rem rgba(66, 66, 66, 0.075);
box-shadow: 0 1.5625rem 2.8125rem rgba(66, 66, 66, 0.075);
-webkit-transition: -webkit-box-shadow 0.4s ease;
transition: -webkit-box-shadow 0.4s ease;
-o-transition: box-shadow 0.4s ease;
transition: box-shadow 0.4s ease;
transition: box-shadow 0.4s ease, -webkit-box-shadow 0.4s ease;
}
.shadow-warning {
-webkit-box-shadow: 0 0 3rem 0 rgba(255, 201, 40, 0.3) !important;
box-shadow: 0 0 3rem 0 rgba(255, 201, 40, 0.3) !important;
}
.shadow-icon {
-webkit-filter: drop-shadow(5px 5px 5px rgba(255, 201, 40, 0.3));
filter: drop-shadow(5px 5px 5px rgba(255, 201, 40, 0.3));
}
.icon-group {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
}
.icon-group .icon-item:not(:last-child) {
margin-right: 0.5rem;
}
.icon-item {
border-radius: 50%;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
color: #757575;
-webkit-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
height: 2.5rem;
width: 2.5rem;
border: 0;
font-size: 0.875rem;
-webkit-box-shadow: 0 1.5625rem 2.8125rem rgba(0, 87, 255, 0.15);
box-shadow: 0 1.5625rem 2.8125rem rgba(0, 87, 255, 0.15);
}
.icon-item:hover,
.icon-item:focus {
background-color: #f5f5f5;
}
.icon-item.icon-item-sm {
height: 1.875rem;
width: 1.875rem;
}
.icon-item.icon-item-lg {
height: 2.75rem;
width: 2.75rem;
}
.fontawesome-i2svg-active .icon-indicator {
opacity: 1;
}
.fit-cover {
-o-object-fit: cover;
object-fit: cover;
}
.z-index-1 {
z-index: 1;
}
.z-index-2 {
z-index: 2 !important;
}
.z-index--1 {
z-index: -1;
}
.sticky-sidebar {
position: -webkit-sticky;
position: sticky;
z-index: 1020;
top: 5.3125rem;
}
.circle-dashed {
border: 1px dashed #0e6fff;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
border-radius: 50%;
width: 3.5rem;
height: 3.5rem;
}
.hover-text-decoration-none:hover,
.hover-text-decoration-none:focus {
text-decoration: none;
}
.resize-none {
resize: none;
}
.collapsed .collapse-icon {
-webkit-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
-webkit-transform: rotate(0deg);
-ms-transform: rotate(0deg);
transform: rotate(0deg);
}
.collapse-icon {
-webkit-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
-webkit-transform: rotate(90deg);
-ms-transform: rotate(90deg);
transform: rotate(90deg);
}
[data-dismiss="dropdown"] *,
[data-offset-top] *,
[data-toggle="collapse"] *,
[data-toggle="tooltip"] *,
[data-toggle="popover"] * {
pointer-events: none;
}
.outline-none {
outline: none;
-webkit-box-shadow: none;
box-shadow: none;
}
.outline-none:hover,
.outline-none:focus {
outline: none;
-webkit-box-shadow: none;
box-shadow: none;
}
.vertical-line:after {
position: absolute;
content: "";
height: 75%;
width: 1px;
background: #eee;
right: 0;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
}
.vertical-line.vertical-line-400:after {
background-color: #e0e0e0;
}
.transition-base {
-webkit-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out;
}
.transition-none {
-webkit-transition: none;
-o-transition: none;
transition: none;
}
.fsp-75 {
font-size: 75%;
}
.min-w-0 {
min-width: 0;
}
.terms-sidebar .nav-link {
color: #bdbdbd;
font-weight: 500;
font-family: "Yantramanav", "Open Sans", -apple-system, BlinkMacSystemFont,
"Segoe UI", "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji",
"Segoe UI Emoji", "Segoe UI Symbol";
}
.terms-sidebar .nav-link.active {
color: #0e6fff;
}
.icon {
padding: 1rem;
border-radius: 15px;
display: -webkit-inline-box;
display: -ms-inline-flexbox;
display: inline-flex;
background-color: rgba(255, 254, 254, 0.2);
-webkit-backdrop-filter: blur(10px);
backdrop-filter: blur(10px);
border: 2px solid rgba(255, 254, 254, 0.3);
}
.icon-primary {
color: #0e6fff;
}
.icon-secondary {
color: #ffc928;
}
.icon-success {
color: #79b93c;
}
.icon-info {
color: #24ffea;
}
.icon-warning {
color: #ffc928;
}
.icon-danger {
color: #fd4032;
}
.icon-light {
color: #f9fafd;
}
.icon-dark {
color: #23242a;
}
.img-landing-banner {
overflow: hidden;
-webkit-transform: translateY(-3rem);
-ms-transform: translateY(-3rem);
transform: translateY(-3rem);
margin-bottom: -8rem;
-webkit-transition: -webkit-transform 0.4s ease;
transition: -webkit-transform 0.4s ease;
-o-transition: transform 0.4s ease;
transition: transform 0.4s ease;
transition: transform 0.4s ease, -webkit-transform 0.4s ease;
position: relative;
display: block;
}
@media (min-width: 1540px) {
.img-landing-banner {
margin-bottom: -22rem;
}
}
@media (min-width: 1200px) and (max-width: 1539.98px) {
.img-landing-banner {
margin-bottom: -18rem;
}
}
.img-landing-banner:after {
content: "";
position: absolute;
left: 0;
bottom: 0;
width: 100%;
height: 70%;
-webkit-transition: opacity 0.6s;
-o-transition: opacity 0.6s;
transition: opacity 0.6s;
}
.img-landing-banner:hover,
.img-landing-banner:focus {
-webkit-transform: translateY(-5rem);
-ms-transform: translateY(-5rem);
transform: translateY(-5rem);
}
.img-landing-banner:hover:after,
.img-landing-banner:focus:after {
opacity: 0;
}
.navbar-space {
-webkit-backdrop-filter: blur(10px);
backdrop-filter: blur(10px);
background-image: -webkit-gradient(
linear,
left top,
left bottom,
from(#fff4d4),
to(#fff)
);
background-image: -o-linear-gradient(#fff4d4, #fff);
background-image: linear-gradient(#fff4d4, #fff);
}
.btn-glow {
position: relative;
}
.btn-glow::before {
content: "";
height: 80%;
width: 80%;
position: absolute;
top: 10%;
left: 10%;
display: inline-block;
background-color: inherit;
opacity: 0.55;
-webkit-filter: blur(26px);
filter: blur(26px);
-webkit-transform: translateY(45%);
-ms-transform: translateY(45%);
transform: translateY(45%);
z-index: -1;
border-radius: 10px;
}
.btn-gradient:hover {
-webkit-box-shadow: 0 10px 20px #d42da3, 0 6px 6px #0e6fff;
box-shadow: 0 10px 20px #d42da3, 0 6px 6px #0e6fff;
}
.btn {
color: #fffefe;
}
.hover-top {
-webkit-transform: translateY(0) translateZ(0);
transform: translateY(0) translateZ(0);
-webkit-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
.hover-top.hover-top-shadow-lg:hover,
.hover-top.hover-top-shadow-lg:focus {
-webkit-transform: translateY(-0.3125rem) translateZ(0);
transform: translateY(-0.3125rem) translateZ(0);
}
.hover-top:hover,
.hover-top:focus {
-webkit-transform: translateY(-0.125rem) translateZ(0);
transform: translateY(-0.125rem) translateZ(0);
-webkit-box-shadow: 0.5rem 0.5rem 1.5rem rgba(110, 74, 156, 0.1) !important;
box-shadow: 0.5rem 0.5rem 1.5rem rgba(110, 74, 156, 0.1) !important;
background-color: #d42da3;
color: #fffefe;
}
.hover-top:hover .heading-color,
.hover-top:focus .heading-color {
color: #fffefe;
}
.hvr-icon-forward {
-webkit-transition-duration: 0.1s;
-o-transition-duration: 0.1s;
transition-duration: 0.1s;
}
.hvr-icon-forward .hover-icon {
-webkit-transform: translateZ(0);
transform: translateZ(0);
-webkit-transition-duration: 0.1s;
-o-transition-duration: 0.1s;
transition-duration: 0.1s;
-webkit-transition-property: -webkit-transform;
transition-property: -webkit-transform;
-o-transition-property: transform;
transition-property: transform;
transition-property: transform, -webkit-transform;
-webkit-transition-timing-function: ease-out;
-o-transition-timing-function: ease-out;
transition-timing-function: ease-out;
}
.hvr-icon-forward:hover .hover-icon,
.hvr-icon-forward:focus .hover-icon,
.hvr-icon-forward:active .hover-icon {
-webkit-transform: translateX(4px);
-ms-transform: translateX(4px);
transform: translateX(4px);
}
.badge {
line-height: 0.8125rem;
}
.badge-circle {
height: 2rem;
width: 2rem;
border-radius: 50%;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
padding: 0 0.5rem;
}
@media (min-width: 768px) {
.badge-circle {
height: 3.4rem;
width: 3.4rem;
border-radius: 50%;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
padding: 0 1rem;
}
}
.badge-foodwagon {
border-radius: 0 1.25rem 0 1rem;
}
.card-badge {
position: absolute;
top: 13rem;
z-index: 1;
}
.card-actions {
position: absolute;
bottom: 0;
z-index: 1;
width: 100%;
}
.carousel-icon {
width: auto;
}
.carousel-icon .carousel-control-prev-icon:hover {
background-color: #fffefe !important;
}
.carousel-icon .carousel-control-next-icon:hover {
background-color: #fffefe !important;
}
.card-span {
-webkit-transition: all 0.4s ease;
-o-transition: all 0.4s ease;
transition: all 0.4s ease;
border: 0;
}
.card-span .card-span-img {
position: absolute;
left: 50%;
-webkit-transform: translate3d(-50%, -50%, 0);
transform: translate3d(-50%, -50%, 0);
}
.input-group-icon {
position: relative;
}
.input-group-icon .input-box {
padding-left: 2.8rem;
vertical-align: middle;
}
.input-group-icon .input-box-icon {
position: absolute;
top: 50%;
left: 1rem;
color: #eee;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
}
.form-foodwagon-control {
border: 0 solid #e0e0e0;
border-radius: 0.25rem;
}
input[type="date"]::-webkit-calendar-picker-indicator {
width: 10px;
background-image: url("data:image/svg+xml,%3C%3Fxml version='1.0'%3F%3E%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' xmlns:svgjs='http://svgjs.com/svgjs' version='1.1' width='512' height='512' x='0' y='0' viewBox='0 0 451.847 451.847' style='enable-background:new 0 0 512 512' xml:space='preserve' class=''%3E%3Cg%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M225.923,354.706c-8.098,0-16.195-3.092-22.369-9.263L9.27,151.157c-12.359-12.359-12.359-32.397,0-44.751 c12.354-12.354,32.388-12.354,44.748,0l171.905,171.915l171.906-171.909c12.359-12.354,32.391-12.354,44.744,0 c12.365,12.354,12.365,32.392,0,44.751L248.292,345.449C242.115,351.621,234.018,354.706,225.923,354.706z' fill='%23607080' data-original='%23000000' style='' class=''/%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3Cg xmlns='http://www.w3.org/2000/svg'%3E%3C/g%3E%3C/g%3E%3C/svg%3E%0A");
padding: 0px;
margin-left: auto;
margin-right: auto;
}
.border-navbar-gradient {
background: -webkit-gradient(
linear,
left top,
right top,
from(rgba(255, 255, 255, 0)),
color-stop(10.94%, rgba(255, 255, 255, 0.890625)),
color-stop(86.46%, #fff),
to(rgba(255, 255, 255, 0))
);
background: -o-linear-gradient(
left,
rgba(255, 255, 255, 0) 0%,
rgba(255, 255, 255, 0.890625) 10.94%,
#fff 86.46%,
rgba(255, 255, 255, 0) 100%
);
background: linear-gradient(
90deg,
rgba(255, 255, 255, 0) 0%,
rgba(255, 255, 255, 0.890625) 10.94%,
#fff 86.46%,
rgba(255, 255, 255, 0) 100%
);
-webkit-backdrop-filter: blur(60px);
backdrop-filter: blur(60px);
}
.backdrop {
-webkit-backdrop-filter: blur(4px);
backdrop-filter: blur(4px);
}
.majestic-tabs {
border-bottom: 0;
}
.majestic-tabs .nav-link {
border: 2px solid transparent;
color: #616161;
}
.majestic-tabs .nav-link:hover,
.majestic-tabs .nav-link:focus {
border-color: transparent;
}
.majestic-tabs .nav-link.active,
.majestic-tabs .nav-item.show .nav-link {
border-bottom-color: #f17228;
}
/
Try saving that as a separate custom css file and then use the new bootstrap v5 css istead of the theme.css.
I have no idea if it will work as the alpha css file seems to be about 7000 lines longer than the current version. One of the reasons why its best to wait until a version is established rather than jumping on the alpha bandwagon.
If its already working then why the need to change it anyway?