Paste this css code below int the Codeixer > product gallery > Advanced settings > Custom CSS field
a.woocommerce-product-gallery__lightbox.wpgs-video {
width: 100%;
height: 100%;
display: block;
opacity: 1 !important;
background:transparent;
}
a.woocommerce-product-gallery__lightbox.wpgs-video i {
width: 100%;
height: 100%;
display: block;
align-items: center;
justify-content: center;
display: flex;
font-size: 80px;
color: #fff;
margin: 0 !important;
}
.wpgs-image .wpgs-video i:before {
border-radius: 50%;
padding-left: 10px;
box-shadow: 0px 0px 10px 0px #fff;
}