index.css

body {
    font-family: Arial, sans-serif;
    width: 200px;
    display: flex;
    flex-direction: column;
}
.heading {
    font-weight: bold;
    font-size: 14px;
}

.version {
    font-size: 11px;
    color: #939393;
}

.main-content {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    font-weight:400;
}

/* The switch - the box around the slider */
.switch {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
  }
  
  /* 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: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
  }
  
  input:checked + .slider {
    background-color: #2196F3;
  }
  
  input:focus + .slider {
    box-shadow: 0 0 1px #2196F3;
  }
  
  input:checked + .slider:before {
    -webkit-transform: translateX(16px);
    -ms-transform: translateX(16px);
    transform: translateX(16px);
  }
  
  /* Rounded sliders */
  .slider.round {
    border-radius: 34px;
  }
  
  .slider.round:before {
    border-radius: 50%;
  }

  .underline {
    padding: 10px;
    border-bottom: 1px solid lightgray;
  }