.video_responsive{
    overflow:hidden;
    padding-bottom:56.25%;
    position:relative;
    height:0;
}
.video_responsive iframe{
    left:0;
    top:0;
    height:100%;
    width:100%;
    position:absolute;
}

.color_mode {
    position: fixed;
    right: 20px;
    top: 20px;
    font-size: 23px;
    border: none;
    background-color: #292929;
    z-index: 1000;
    transition: background-color 0.3s ease;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 50%;
}

@media (max-width: 768px) {
    .color_mode {
        right: 12px;
        top: 12px;
        font-size: 18px;
    }
}