* {
  margin: 0;
  padding: 0;
}

.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: aliceblue;
}
.btn {
  width: 200px;
  height: 100px;
  background: #c1c1c1;
  border-radius: 200px;
  cursor: pointer;
  position: relative;
  box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
}
.btn::before {
  position: absolute;
  content: "";
  width: 90px;
  height: 90px;
  background-color: #fff;
  border-radius: 50%;
  margin: 5px;
  transition: 0.5s;
}
input:checked + .btn {
  background-color: #dc143c;
}
input:checked + .btn::before {
  transform: translateX(100px);
}
input {
  display: none;
}