自定义滑块定位其上的元素。(HTML+CSS)

<div class="slider-container">
  <input type="range" min="0" max="100" value="50" class="slider">
  <div class="slider-element"></div>
</div>

.slider-container {
  position: relative;
  width: 200px;
  height: 20px;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 5px;
  background-color: #ddd;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

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

.slider-element {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 20px;
  background-color: #4CAF50;
}