* {
    box-sizing: border-box;
  }
  
  .row::after {
    content: "";
    clear: both;
    display: table;
  }
  
  [class*="col-"] {
    float: left;
    padding: 15px;
  }
  
  html {
    font-family: "Lucida Sans", sans-serif;
  }
  
  .header {
    background-color: #9933cc;
    color: #ffffff;
    padding: 15px;
  }
  
  .menu ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
  }
  
  .menu li {
    padding: 8px;
    margin-bottom: 7px;
    background-color: #33b5e5;
    color: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  }
  
  .menu li:hover {
    background-color: #0099cc;
  }
  
  .aside {
    background-color: #33b5e5;
    padding: 15px;
    color: #ffffff;
    text-align: center;
    font-size: 14px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  }
  
  .footer {
    background-color: #0099cc;
    color: #ffffff;
    text-align: center;
    font-size: 12px;
    padding: 15px;
  }
  
  /* For mobile phones: */
  [class*="col-"] {
    width: 100%;
  }
  
  @media only screen and (min-width: 600px) {
    /* For tablets: */
    .col-s-3 {width: 25%;}
    .col-s-9 {width: 75%;}
    .col-s-12 {width: 100%;}
  }
  @media only screen and (min-width: 768px) {
    /* For desktop: */
    .col-3 {width: 25%;}
    .col-6 {width: 50%;}
  }