html, body {
    padding: 0; margin: 0;
    text-align: center;
    background: #1dba9d;
    color: #e0d336;
}

div {
    font-size: 1.5em;
}

#gainContainer {
    background: #F79F79;
    width: 100%;
}

#panningContainer {
    background: #5b6f69;
    width: 100%;
}

#delayContainer {
    background: #7883bf;
    width: 100%;
}

#playStopButton {
    background-color: #e0d336;
    border: none;
    color: #1dba9d;
    font-size: 2.8em;
    padding: 0.5em 1.5em;
}

#playStopButton:active {
   background: #ffffff;
}

.slider {
    margin: 0;
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 25px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}

.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    background: #1dba9d;
    cursor: pointer;
}