.slider {
  -webkit-appearance: none;
  width: 150px;
  height: 10px;
  border-radius: 5px;
  background: #e4ddf1;
  outline: none;
  opacity: 0.7;
  -webkit-transition: 0.2s;
  transition: opacity 0.2s;
  transform: scalex(-1);
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--slider-thumb-size);
  height: var(--slider-thumb-size);
  border-radius: 50%; 
  background: var(--slider-background-colour);
  border: 4px solid var(--slider-border-colour);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: var(--slider-thumb-size);
  height: var(--slider-thumb-size);
  border-radius: 50%; 
  background: var(--slider-background-colour);
  border: 4px solid var(--slider-border-colour);
  cursor: pointer;
}