style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300&display=swap');

* {
  margin: 0;
  padding: 0;
  font-family: "Poppins", sans-serif;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #151515;
}
div {
  position: absolute;
}
p {
  position: relative;
  display: block;
  text-align: center;
  font-size: 6em;
  color: #999;
  font-weight: 400;
}
.myslider1 {
  width: 400px;
  height: 15px;
  -webkit-appearance: none;
  background: #111;
  outline: none;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 1);
}
.myslider1::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: #00fd0a;
  cursor: pointer;
  border: 4px solid #333;
  box-shadow: -407px 0 0 400px #00fd0a;
}