styles.css

.container {
    width: 300px;
    padding: 20px;
    text-align: center;
  }
  
  h1 {
    margin-top: 0;
  }
  
  .switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
  }
  
  .switch input[type="checkbox"] {
    display: none;
  }
  
  input[type="text"] {
    width: 100%;
    margin-top: 10px;
    padding: 10px;
  }
  
  button {
    margin-top: 10px;
    padding: 10px 20px;
  }

  .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.4s;
    border-radius: 34px;
  }
  
  .slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
  }
  
  .switch input[type="checkbox"].active + .slider {
    background-color: blue;
  }
  
  .switch input[type="checkbox"].active + .slider:before {
    transform: translateX(26px);
  }
  
  .highlight {
    background-color: yellow;
    font-weight: bold;
  }