style.css

body {
    background: #191919;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    padding-top: 20px;
    font-family: 'Open Sans', sans-serif;
}

audio {
    width: 100%;
    opacity: 0.75;
}

#div-eq-container {
    height: 255px;
    position: relative;
    margin: 10px;
    -webkit-box-reflect: below 53px -webkit-gradient(linear, left top, left bottom, from(transparent), to(rgba(255, 255, 255, 0.30)));
}

.vis-circle {
    position: absolute;
    border-radius: 50%;
}

#visualisation > div {
    display: inline-block;
    position: absolute;
    bottom: 0px;
}

#round-visualisation{
    position: absolute;
    width: 4%; 
    height:4%; 
    top:48%; 
    left: 48%; 
    background:#bf1aee; 
    border-radius: 50%
}


#div-vis-round{
    position: relative; 
    top: 0%; 
    width: 30vmin; 
    height: 30vmin;
}

.center-div{
    display: block;
    margin-right: auto;
    margin-left: auto;
}

.button-container{
    width:250px;
}

.play-button{
    padding: 5px 20px;
    border-radius: 4px;
    border: 1px solid black;
    margin-top: 20px;
    cursor:pointer;
}