Hello I am creating a webpage and want to create a on off switch, which switches my website from english to german. to illustrate that better i want the switch to change from the english flag to the german flag (optionally: with a 180 degree spin). my code is as following:

<label class="switch">
  <input type="checkbox">
  <span class="slider round"></span>
  <div class="background"></div>
</label>

/* The switch - the box around the slider */
.switch {
  position: relative;
  display: inline-block;
  width: 42px;
  height: 23.8px;
}

/* Hide default HTML checkbox */
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

/* The slider */
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18.2px;
  width: 18.2px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked + .slider {
  background-color: #FF5733;
}

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  -webkit-transform: translateX(18.2px);
  -ms-transform: translateX(18.2px);
  transform: translateX(18.2px);
}

/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

i tried using svg and adjusting them via css. because of that transitions like .slider: before or input: checked couldnt work anymore. also even if they did work they wouldnt be user friendly…