controls.css

#main-controls {
    top: 20px;
    left: 20px;
    width: 20%;
    min-width: 280px;
    z-index: 1000;
    position: absolute;
    background-color: #444141;
    padding: 1%;
    border-radius: 10px;
    opacity: 0.4;
    -webkit-transition: .2s;
    transition: opacity .2s;
    /*pointer-events: none;*/
}

#main-controls:hover {
    opacity: 0.9;
}

.sliders-container {
    border: 3px solid #6b6464;
    padding: 4%;
    border-radius: 2px;
}

.slider-container {
    width: 100%; /* Width of the outside container */
    padding-bottom: 35px;
    opacity: 0.5;
    -webkit-transition: .2s;
    transition: opacity .2s;
    display: block;
}

.slider-container:last-child {
    padding-bottom: 15px;
}

.slider-container:hover {
    opacity: 1;
}

.slider:hover {
    cursor: pointer; /* Cursor on hover */
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    outline: none;
    width: 55%;
    height: 12px;
    border-radius: 5px;
    background: #d3d3d3;
    float: left;
    margin: 2px;
}

.slider-value {
    float: left;
    margin-left: 2%;
    margin-right: 2%;
    color: white;
    width: 5%;
    text-align: center;
}

.slider-label {
    float: left;
    padding-left: 2%;
    padding-right: 2%;
    color: white;
    width: 25%;
    text-align: center;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}

.control-container-group {
    display: table;
    margin: 0 auto;
    padding-bottom: 35px;
}

.dropdown {
    position: relative;
    display: inline-block;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
    margin-right: 10px;
}

button:active {
    background-color: #3e8e41;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover button {
    background-color: #3e8e41;
}