Improving back/home button added to manageCover

From your Post #2

void theBody.offsetWidth;

Was used with 2 keyframes/animations, not 1.

In saying that, void theBody.offsetWidth; was never used with 1 keyframe.

Am I missing something here?

body {
  background: #353198;
  animation: fade 2s ease 0s forwards;
}

.bodytoggle {
  animation: fade2 2s ease forwards;
}

@keyframes fade {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes fade2 {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}