:root {
  --toggle-size: 2.25rem;
}

.toggle {
  position: relative;
  display: inline-block;
  width: var(--toggle-size);
  height: calc(var(--toggle-size) * 0.57);
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #bbb;
  -webkit-transition: 0.4s;
  transition: 0.4s;
  border-radius: calc(var(--toggle-size) * 0.57);
}

.slider:before {
  position: absolute;
  content: '';
  height: calc(var(--toggle-size) * 0.43);
  width: calc(var(--toggle-size) * 0.43);
  left: calc(var(--toggle-size) * 0.07);
  bottom: calc(var(--toggle-size) * 0.07);
  background-color: white;
  -webkit-transition: 0.4s;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #04a1e8;
}

input:focus + .slider {
  box-shadow: 0 0 1px #04a1e8;
}

input:checked + .slider:before {
  -webkit-transform: translateX(calc(var(--toggle-size) * 0.43));
  -ms-transform: translateX(calc(var(--toggle-size) * 0.43));
  transform: translateX(calc(var(--toggle-size) * 0.43));
}