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

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

input {
  height: 30px;
  width: 30px;
  appearance: none;
  background-color: black;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  cursor: pointer;
}

.three-state-switch {
  display: flex;
  justify-content: center;
  border: 3px solid black;
  border-radius: 50px;
}

#one {
  opacity: 1;
}