body {
    margin: 0;
    padding: 0;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: #d6d6d6;
    color: #333;
  }
  
  #header {
    background: -webkit-gradient(linear, left top, left bottom, from(#ffffff), to(#cccccc));
    border-bottom: 1px solid #999;
    padding: 10px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.4);
  }
  
  #header h1 {
    font-size: 20px;
    margin: 0;
    color: #000;
  }
  
  /* App card */
  .app {
    background: #fff;
    margin: 20px auto;
    width: 90%;
    max-width: 400px;
    padding: 10px;
    border: 1px solid #aaa;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    -webkit-box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  }
  
  .icon {
    float: left;
    width: 60px;
    height: 60px;
    margin-right: 10px;
    border-radius: 12px;
    border: 1px solid #888;
  }
  
  .details {
    overflow: hidden;
  }
  
  .details h2 {
    margin: 0;
    font-size: 18px;
  }
  
  .details p {
    margin: 4px 0;
    color: #555;
    font-size: 13px;
  }
  
  .install-button {
    display: inline-block;
    padding: 6px 12px;
    margin-top: 8px;
    background: -webkit-gradient(linear, left top, left bottom, from(#4cd964), to(#34c759));
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    font-size: 14px;
    border: 1px solid #28a745;
    text-shadow: 0 -1px 0 rgba(0,0,0,0.3);
  }
  #category-bar {
    padding: 10px;
    background: #dcdcdc;
    border-bottom: 1px solid #888;
    text-align: center;
  }
  
  #category-select {
    font-size: 14px;
    padding: 6px;
    border: 2px inset #ccc;
    border-radius: 4px;
    background: #f4f4f4;
    color: #000;
    font-family: "Helvetica", sans-serif;
  }