.topnav {
    background-color: #202020;
    overflow: hidden;
  }
  
  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
  }
  
  .topnav a:hover {
    background-color: #ddd;
    color: black;
  }

  #customers {
    font-family: Arial, Helvetica, sans-serif;
    border-collapse: collapse;
    width: 50%;
  }
  
  #customers td, #customers th {
    border: 1px solid hsl(0, 0%, 82%);
    padding: 8px;
  }
  
  #customers tr:hover {background-color: #5c5c5c;}
  .card {
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
    transition: 0.3s;
    width: 40%;
  }
  footer {
    text-align: center;
    padding: 3px;
    background-color: #202020;
    color: white;
  }
  body{
    background-color: #202020;
}
p,li,h1,h2,h3,td{
 color: white;
}
header{
  text-align: center;
}