style.css

.controls{
    display: flex;
    direction: row;
    flex-wrap: wrap;
    justify-content: space-around;
}

.slidecontainer {
    display: flex;
    flex-direction: row;
}

.sliderdiv {
    display: block;
    text-align: center;
}

.dropdowndiv{
    display: block;
    text-align: center;
}

canvas{
      user-select: none;
}
  

canvas#spectrum {
}
canvas#waveform {
}
.visual_container{
    display: flex;
    justify-content: space-evenly;
    flex-flow: row wrap;
}
.analyser_container{
    display: flex;
    justify-content: flex-start;
    flex-flow: column wrap;
}
.visualizer{
}
.wave_draw_canvas{
}

.slider {
    -webkit-appearance: none;  /* Override default CSS styles */
    appearance: none;
    background: rgb(41,255,255); /* Grey background */
    outline: none; /* Remove outline */
    opacity: 0.7; /* Set transparency (for mouse-over effects on hover) */
    -webkit-transition: .2s; /* 0.2 seconds transition on hover */
    transition: opacity .2s;
    margin: 20px;
    padding: 0;
    border-radius: 10px;
    display: inline;
}
.slider:hover {
    opacity: 1; /* Fully shown on mouse-over */
}
.slider::-webkit-slider-thumb {
    -webkit-appearance: none; /* Override default look */
    appearance: none;
    width: 50px; /* Set a specific slider handle width */
    height: 50px; /* Slider handle height */
    background: yellow; /* Green background */
    cursor: pointer; /* Cursor on hover */
    border-radius: 50%;
}
.slider::-moz-range-thumb {
    width: 25px; /* Set a specific slider handle width */
    height: 25px; /* Slider handle height */
    background: rgb(40, 209, 45); /* Green background */
    cursor: pointer; /* Cursor on hover */
}
input[type=range]
{
    writing-mode: bt-lr; /* IE */
    -webkit-appearance: slider-vertical; /* WebKit */
    width: 8px;
    padding: 0 5px;    
}