* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: crimson;
  font-family: sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
}

.range-container {
  position: relative;
}

input[type="range"] {
  width: 300px;
  margin: 18px 0;
  outline: none;
  -webkit-appearance: none;
}

#range-content {
  position: absolute;
  left: 50%;
  top: -50px;
  transform: translateX(-50%);
  background: #000;
  color: #fff;
  white-space: nowrap;
  padding: 10px 15px;
  border-radius: 7px;
  transition: opacity 0.5s ease;
}

#range-content::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translateX(-50%);
  border: 15px solid;
  border-color: #000 #0000 #0000 #0000;
}

input[type="range"]::-webkit-slider-runnable-track {
  background-color: #000;
  width: 100%;
  height: 10px;
  cursor: pointer;
  border-radius: 2px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 24px;
  width: 24px;
  background-color: #fff;
  border-radius: 50%;
  border: 1px solid black;
  margin-top: -7px;
  cursor: pointer;
}