body{
  background:#efdec1;
  font-size:  14px;
  font-family: Verdana, sans-serif;
}

  .container{
    width: 400px;
    margin: 8px auto;
    background: #fff;
    border-radius:4px;
    padding: 16px;
    position: relative;

  }

  #question {
    margin-bottom: 16px;
    font-weight: bold;
  }

  #choices{
    list-style: none;
    padding: 0px;
    margin-bottom: 16px;
  }


  #choices > li {
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 10px;
    margin: 10px;
    cursor:pointer;
    background-color: white;

  }

  #choices > li:hover{
    background: #f8f8f8;
  }

  #choices > li.correct{
    background: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
    font-weight: bold;
  }

  #choices > li.correct::after {
    content: '... 正解!'
  }


  #choices > li.wrong{
    background: #f8d8da;
    border-color: #f5c6cb;
    color: #721c24;
    font-weight: bold;
  }

    #choices > li.wrong::after {
    content: '... 残念!'
  }


  #btn, #result > a {
    background-color: #3498db;
    padding: 8px;
    border-radius: 4px;
    cursor:pointer;
    text-align: center;
    color: #fff;
    box-shadow: 0 4px 0 #2880b9;
  }



  #btn.disabled{
    background:#ccc;
    box-shadow: 0 4px 0 #bbb;
    opacity: :0.7;
  }

  #result {
    position: absolute;
    width: 300px;
    background-color: #fff;
    padding: 30px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    top: 60px;
    left: 0;
    right: 0;
    margin: 0 auto;
    border-radius:  4px;
    text-align: center;
    transition: 0.4s;
  }

  #result.hidden{
  transform: translate(0, -1500px);
  }



  #result > p {
    font-size: 24px;
  }


  #result > a {
    display: block;
    text-decoration: none;

  }