* {
    margin: 0;
  }
  
  html,
  body {
    height: 100%;
  }
  
  body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #ffffff;
  }
  
  p {
    margin: 0.5em 0 0.5em 0;
  }
  
  header {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #787878;
    padding: 10px;
  }
  
  nav a:visited,
  nav a:link {
    color: #fff;
    text-decoration: none;
  }
  
  nav > ul {
    display: inline;
    padding: 0;
  }
  
  nav > ul > li {
    display: inline-block;
    list-style: none;
    margin: 0 5px 0 5px;
  }
  
  main {
    display: block;
   /* background-image: url("images/background.png"); */
    padding-top: 3em;
    padding-bottom: 3em;
    min-height: 85%;
  }
  
  footer {
    padding: 15px;
  }
  
  aside,
  article {
    padding: 2em;
  }
  
  aside {
    text-align: center;
  }
  
  article {
    width: 75%;
  }
  
  .columns {
    display: flex;
  }
  
  @media only screen and (min-width: 768px) {
    main {
      display: flex;
    }
  
    aside {
      margin-left: 2%;
    }
  
    .columns-desktop {
      display: flex;
    }
  }
  
  /* Shoe */
  .shoe {
    width: 200px;
    padding: 10px;
    margin: 10px;
    background-color: #fff;
    border: solid 1px #ccc;
  }
  
  .shoe img {
    width: 100%;
  }
  
  .shoe .title {
    font-weight: bold;
  }
  
  .shoe .price {
    text-align: right;
  }
  
  .shoe .columns {
    width: 100%;
  }
  
  .shoe .columns div {
    width: 50%;
  }
  
  .shoe button {
    background-color: #f6aeae;
    padding: 10px;
    border: solid 1px #f6aeae;
    border-radius: 3px;
    color: #fff;
  }