.fa {
    padding: 20px;
    font-size: 30px;
    width: 50px;
    aligh-items: right;
    text-decoration: none;
    color: rgb(0, 132, 255);
}
:root {
    --primary-color: #302AE6;
    --secondary-color: #536390;
    --font-color: #424242;
    --bg-color: #fff;
    --heading-color: #292922;
}
[data-theme="dark"] {
    --primary-color: #9A97F3;
    --secondary-color: #818cab;
    --font-color: #e1e1ff;
    --bg-color: #161625;
    --heading-color: #818cab;
}
body {
    background-color: var(--bg-color);
    color: var(--font-color);

    /*other styles*/
    .....
}

h1 {
    color: var(--secondary-color);

    /*other styles*/
    .....
}

a {
    color: var(--primary-color);

    /*other styles*/
    .....
}
.theme-switch-wrapper {
    display: flex;
    align-items: center;
  
    em {
      margin-left: 10px;
      font-size: 1rem;
    }
  }
  .theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
  }
  
  .theme-switch input {
    display:none;
  }
  
  .slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
  }
  
  .slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
  }
  
  input:checked + .slider {
    background-color: #66bb6a;
  }
  
  input:checked + .slider:before {
    transform: translateX(26px);
  }
  
  .slider.round {
    border-radius: 34px;
  }
  
  .slider.round:before {
    border-radius: 50%;
  }