.max-height-300 pre {
    max-height: 300px;
  }
  
  .theme-switch {
    display: inline-block;
    height: 24px;
    position: relative;
    width: 50px;
  }
  
  .theme-switch input {
    display: none;
  }
  
  .slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: 400ms;
  }
  
  .slider::before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 16px;
    left: 4px;
    position: absolute;
    transition: 400ms;
    width: 16px;
  }
  
  input:checked + .slider {
    background-color: #66bb6a;
  }
  
  input:checked + .slider::before {
    transform: translateX(26px);
  }
  
  .slider.round {
    border-radius: 34px;
  }
  
  .slider.round::before {
    border-radius: 50%;
  }