SOURCE

<div class="switch-group">
  <label class="switch">
    <input type="checkbox">
    <div class="switch-media"></div>
    <span class="switch-title">英语</span>
  </label> 
</div>

.switch-group {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.switch {
  display: flex;
  align-items: center;
}
.switch > input {
  display: none;
}
.switch-media {
  position: relative;
  display: inline-block;
  box-sizing: border-box;
  width: 40px;
  height: 24px;
  border: 2px solid #e6e6e6;
  background-color: #fff;
  border-radius: 20px;
  transition: all 300ms linear;
}
.switch-media:after {
  position: absolute;
  top: 2px;
  left: 2px;
  content: "";
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: #e6e6e6;
  transition: all 300ms linear;  
}
.switch input:checked + .switch-media {
  border-color: #31b794;
}
.switch input:checked + .switch-media:after {
  left: calc(100% - 18px);
  background-color: #31b794;
}