body{
    background-color: #000000;
    padding: 1em 5em;
  }
  
  /* Add a black background color to the top navigation */
  .topnav {
    background-color: #000000;
    overflow: hidden;
  }
  
  /* Style the links inside the navigation bar */
  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
    font-family: "Source Code Pro", sans-serif;
  }
  
  /* Change the color of links on hover */
  .topnav a:hover {
    background-color: #ddd;
    color: black;
  }
  
  /* Add a color to the active/current link */
  .topnav a.active {
    background-color: #712edc;
    color: white;
  }
  
  .container {
    max-width: auto;
    margin: 5 auto;
    padding: 4em;
    text-align: justify;
    background-color: #712edc;
  }
    
    h1 {
      text-align: center;
      font-size: 3em;
      margin-bottom: 1em;
      font-family: "Source Code Pro", sans-serif;
    }
    
    h2 {
      font-size: 2em;
      margin-top: 2em;
      font-family: "Source Code Pro", sans-serif;
    }
    
    iframe {
      display: block;
      margin: 5em auto;
      max-width: 100%;
    }
  
    p{
      font-family: "Source Code Pro", sans-serif;
      font-weight: 300px;
    }
    
    .alert {
      padding: 20px;
      background-color: #f44336; /* Red */
      color: white;
      margin-bottom: 15px;
    }
    
    /* The close button */
    .closebtn {
      margin-left: 15px;
      color: white;
      font-weight: bold;
      float: right;
      font-size: 22px;
      line-height: 20px;
      cursor: pointer;
      transition: 0.3s;
    }
    
    /* When moving the mouse over the close button */
    .closebtn:hover {
      color: black;
    }