Add this code to the Custom CSS field on the Appearance tab of your YouTube Gallery widget’s settings:
span.yottie-widget-feed-section-pagination-bullet{
padding: 10px 14px;
font-size: 14px;
}
span.yottie-widget-feed-section-pagination-bullet-more::after,
span.yottie-widget-feed-section-pagination-bullet-more::before {
top: 17px;
}