.vertical-slider {
  height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.slider {
  writing-mode: bt-lr; /* Bottom-to-top writing mode for vertical slider */
  appearance: none;
  width: 10px;
  height: 100px;
  background: #ddd;
  outline: none;
  transform: rotate(270deg);
  margin-bottom: 10px;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  background: #4CAF50;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: #4CAF50;
  cursor: pointer;
}

.slider-value {
  margin: 0;
}