html, body {
    margin:0px;
    font-family: Arial, Helvetica, sans-serif;
  }
  .topnav {
    overflow: hidden;
    background: var(--color-primary);
  }
  .topnav a {
    float: left;
    color: var(--color-secondary);
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
  }
  
  .topnav a:hover {
    background-color: var(--color-secondary);
    color: var(--color-primary);
  }
  
  .topnav a.active {
    background-color: var(--color-primary);
    color: var(--color-secondary);
  }
  .theme-light {
    --color-primary: #0060df;
    --color-secondary: #fbfbfe;
    --color-accent: #fd6f53;
    --font-color: #000000;
  }
  .theme-dark {
    --color-primary: #17ed90;
    --color-secondary: #243133;
    --color-accent: #12cdea;
    --font-color: #ffffff;
  }
  .container {
    display: flex;
    width: 100%;
    height: 100%;
    background: var(--color-secondary);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
  }
  .container h1 {
    color: var(--font-color);
  }
  .container h2 {
    color: var(--font-color);
  }
  .center {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  }
  .switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
    vertical-align: middle;

  }
  
  .switch input { 
    opacity: 0;
    width: 0;
    height: 0;

  }
  
  .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: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    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(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
  }
  
  /* Rounded sliders */
  .slider.round {
    border-radius: 34px;

  }
  
  .slider.round:before {
    border-radius: 50%;

  }
  * {
    box-sizing: border-box; /* always useful when working with border or padding properties, or any other property that can effect the box-model */
  }
  .wrapper {
    text-align: center;
    background: gray; /* so we can actually see what's happening */
    padding: 20px; /* Give us some breathing room */
  }
  ul.a {
    list-style-type: circle;
  }
  p.normal {
    font-weight: normal;
  }
  
  p.light {
    font-weight: lighter;
  }
  
  p.thick {
    font-weight: bold;
  }
  
  p.thicker {
    font-weight: 900;
  }
  .grid-container {
    display: grid;
    grid-template-columns: auto auto auto;
    background-color: var(--color-secondary);
    padding: 10px;
  }
  .grid-item {
    background-color: var(--color-secondary);
    padding: 20px;
    font-size: 30px;
    text-align: center;
  }
  .btn-download {
    background-color: var(--color-secondary);
    border: none;
    color: var(--color-primary);
    padding: 12px 30px;
    cursor: pointer;
    font-size: 20px;
  }
  
  /* Darker background on mouse-over */
  .btn-download:hover {
    background-color: var(--color-secondary);
  }
  .container-btn {
    height: 200px;
    position: relative;
  }
  
  .vertical-center {
    margin: 0;
    position: absolute;
    top: 250px;
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
  }
  .form {
    padding: 20px;
    width: 50px;
    height: 50px;
    margin: 20px;
    display: inline-block;
    vertical-align: top; /* here */
    margin-left: 575px ;
    }