*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  background: #8FBC8F;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
div{
  position: relative;
}
#rangeValue{
  position: absolute;
  top: 2px;
  right: -50px;
  background: #fff;
  text-align: center;
  width: 40px;
  padding: 2px;
  border-radius: 3px;
}
#rangeValue::before{
  content: '';
  position: absolute;
  top: 50%;
  left: -5px;
  width: 10px;
  height: 10px;
  transform: translateY(-50%) rotate(45deg);
  background: #fff;
}
.range{
  width:250px;
  height: 2px;
  background: #fff;
  outline: none;
}
.range::-webkit-slider-thumb,
.range::-moz-slider-thumb{
  appearance: none;
  -moz-appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #f00;
  color: #080;
}