File upload button is hidden in contact form 7 file upload plugn

In Contact form 7 plugin File upload button is hidden in ,can you tell mow to unhide it as its not allowing me to show upload button

In CSS file the button opacity: 0; make the opacity higher to show the button.

I made below ,but not helping much

.form-group input[type=file] {
position: absolute;
z-index: 100;
top: 0;
right: 0;
bottom: 0;
left: 0;
width: 100%;
height: 100%;
opacity: 90;

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