body {
  background-color: rgb(20, 120, 230);
  --siteColor: white;
}

/* Das label-Element */
.switch {
  /* Um im nächsten Schritt den runden Button mit position:absolute festzusetzen */
  position: relative;
  width: 64px;
  height: 28px;
  display: inline-block;
}

/* Der graue Untergrund des Schalters */
.switch span {
  position: absolute;
  background-color: rgb(20, 120, 230);
  border: 2px solid white;
  border-radius: 14px;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  transition:  0.5s;
}
/* Der kreisrunde Button im Switch */
.switch span::before {
  background-color: white;
  border: 2px solid white;
  border-radius: 50%;
  content: "";
  position: absolute;
  left: 4px;
  bottom: 3px;
  height: 14px;
  width: 14px;
  transition: 0.5s;
}
input:checked + span {
  background-color: var(--siteColor);
}

input:checked + span::before {
  transform: translateX(34px);
  background-color: white;
  bottom: 2px;
  height: 16px;
  width: 16px;

  border: 2px solid rgb(20, 120, 230);

}

.switch input {
  display: none;
}