* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

.section {
  margin: 30px 60px 30px 15px;
}

.scrubber__knob {
  border-radius: 50%;
  width: 16px;
  height: 16px;
  background-color: orange;
  box-shadow: 0 3px 4px rgba(0,0,0,0.3);
  position: absolute;
  z-index: 3;
  opacity: 1;
  top: -5px;
  transform: translateX(-9px);
  cursor: pointer;
}

.scrubber__back {
  background-color: #DDD;
  width: 100%;
  height: 6px;
  z-index: 2;
  cursor: pointer;
  border-radius: 3px;
  overflow: hidden;
}

.scrubber__fill {
  position: absolute;
  z-index: 1;
  background-color: orange;
  max-width: 100%;
  height: 6px;
  width: 0%;
  cursor: pointer;
  border-radius: 3px 0 0 3px;;
}

.scrubber__load {
  position: absolute;
  z-index: 0;
  background-color: lightgrey;
  max-width: 100%;
  height: 6px;
  width: 0%;
  cursor: pointer;
  border-radius: 3px;
}