* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #4070f4;
  transition: all 0.3s ease-in-out;
}
body.dark {
  background-color: #18191a;
}
.toggle {
  position: relative;
  height: 130px;
  width: 300px;
  border-radius: 100px;
  background-color: #fff;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  cursor: pointer;
}
.toggle::before {
  content: "";
  position: absolute;
  height: 110px;
  width: 110px;
  background: #4070f4;
  border-radius: 50%;
  top: 50%;
  left: 14px;
  transform: translateY(-50%);
  transition: all 0.3s ease-in-out;
}
.toggle.active::before {
  background-color: #18191a;
  left: calc(100% - 110px - 14px);
}