input:checked+.slider {
  background-color: #0078D4;
}

input:checked+.slider:before {
  -webkit-transform: translateX(20px);
  -ms-transform: translateX(20px);
  transform: translateX(20px);
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 1px solid #B6B6B6;
  border-radius: 10px;
  transition: all .1s ease;
  -webkit-transition: all .1s ease;
}

.slider:before {
  position: absolute;
  content: "";
  height: 10px;
  width: 10px;
  left: 4px;
  top: 4px;
  border-radius: 50%;
  transition: all .1s ease;
  -webkit-transition: all .1s ease;
}

.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
}

.switch input {
  width: 0;
  height: 0;
}

@media (prefers-color-scheme: dark) {
  .slider:before {
    background-color: #fff;
  }

  .slider:hover {
    border: 1px solid #fff;
  }
}

@media (prefers-color-scheme: light) {
  .slider:before {
    background-color: #000;
  }

  .slider:hover {
    border-color: #444;
  }

  input[type=checkbox]:checked+.slider:before {
    background-color: #fff;
  }
}