@tetika-0
yeah got annoyed about it too, really dislike it. I haven't figured out how to turn it off automattically yet but inspecting the page element while on youtube when find this style and turning it off in the body works.
<div class="ytp-gradient-bottom" data-layer="8" style="height: 194px; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAADCCAYAAACIaaiTAAABEklEQVQ4T2XI10cFAACF8dvee++67b33uM17b1MkkSSSSBJJJIkkkkQSSSKJ9EfmOw/npfPw8zmBwL/F8IhYE0eJeJNAiUSTRIlkk0KJVEgz6ZTIMJmUyDLZlMgxuZTIM/mUKDCFlCgyxZQoMaWUKDPllKiASlNFiWpTQ4mgqaVEnamnRINppESTaaZEi2mlRJtpp0SH6aREl+mmRA/0mj5K9JsBSgyaIUoMmxFKjJoxSoybCUqEzCQlpsw0JWbMLCXmIGwilIiaeUosmEVKLJllagVWYQ3WYQM2YQu2YQd2YQ/24QAO4QiO4QRO4QzO4QIu4Qqu4QZu4Q7u4QEe4Qme4QVe4Q3e4QM+4Qu+4Qd+/wCa/ysONxfbvQAAAABJRU5ErkJggg==");"></div>