Hello,
Please add this code to the Theme Settings > Custom CSS > Global:
body .product-video-button >a > span {
max-width: 160px;
transition:none;
padding:20px;
}
1) To change the background color of the video button try the following Custom CSS.
.product-video-button > a {
background: red;
color: white;
}
2) To change the color of the icon try the following Custom CSS.
.product-video-button > a::before {
color: white;
}
3) To change the hover text color add the following Custom CSS.
.product-video-button > a:hover {
color: white;
}
You can adjust the colors according to your needs.
Best Regards