main.css

body {
  margin: 0;
  padding: 0;
}

#bg{
  width: 100%;
  position: absolute;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#left{
  margin: 0;
  padding: 0;
  position: absolute;
  top: 0;
  width: 5px;
  height: 100%;
  left: 0;
  background-color: rgb(194, 194, 160);
  border-radius: 0px 10px 10px 0;
  z-index: 4;
}

#right{
  margin: 0;
  padding: 0;
  position: absolute;
  top: 0;
  right: 0;
  width: 5px;
  height: 100%;
  background-color: rgb(194, 194, 160);
  border-radius: 10px 0px 0px 10px;
  z-index: 4;
}

#left:hover{
  width: 250px;
}

#right:hover{
  width: 250px;
}

#img{
  width: 100%;
  height: auto;
}

#middle{
  position: absolute;
  z-index: 5;
  width: 600px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

#middle{
  background: rgba( 255, 255, 255, 0.40 );
  box-shadow: 0 8px 32px 0 rgba( 31, 38, 135, 0.37 );
  backdrop-filter: blur( 8px );
  -webkit-backdrop-filter: blur( 20.0px );
  border-radius: 10px;
  border: 1px solid rgba( 255, 255, 255, 0.18 );
}

#file-input {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 3;
}

#canvas {
  position: fixed;
  left: 5px;
  top: 0;
  width: calc(100% - 10px);
  height: 50%;
  /* backdrop-filter: blur( 3px ); */
}

#canvas2 {
  position: fixed;
  left: 5px;
  bottom: 0;
  width: calc(100% - 10px);
  height: 50%;
  /* backdrop-filter: blur( 3px ); */
}

audio {
  margin-top: 45px;
  width: calc(100% - 25px);
  z-index: 3;
}

#name {
  z-index: 3;
  color: #0e0c0c;
  font-family: monospace;
}

#background {
  width: calc(100% - 10px);
  height: 100%;
  position: absolute;
  top: 0;
  left: 5px;
  background-size: 100% 7px;
  z-index: 1;
  opacity: 0.3;
}

@keyframes bg {
  0%{ background-position: 0 0; }
  100%{ background-position: 8px 8px; }
}