* {
    box-sizing: border-box;
  }

  body {
    font-family:Verdana;
    color:#aaaaaa;

  }

  main {
    
    overflow:auto;
  }
  
  nav {
    float: left;
    width: 20%;
    text-align: center;
  }
  
 nav a {
    background-color: #e5e5e5;
    padding: 8px;
    margin-top: 7px;
    display: block;
    width: 100%;
    color: black;
  }
  
  section {
    float: left;
    width: 60%;
    padding: 0 20px;
    
  }
  
  .right {
    background-color: #e5e5e5;
    float: left;
    width: 20%;
    padding: 15px;
    margin-top: 7px;
    text-align: center;
  }
  
  @media only screen and (max-width: 620px) {
    /* For mobile phones: */
    nav, section, .right {
      width: 100%;
    }
  }

article{
    background: #dad8c69b;
    color: rgb(80, 31, 7);
    }

article header {
    background: #dad8c69b;

}

header {
    padding:15px;
    text-align:center;
    background: yellow;
    color: blue;

}

footer {
    margin-top:7px;
    padding:10px;
    text-align:center;
    padding: 0 10px;
    background: #ccc;
    color: black;
}