article ul {
    width: 12em;
    margin: 0;
    padding: 0.1em;
    line-height: 1;
    /*border: 1px solid black;*/
    /* background-color: silver;*/
  }
 
  article li {
    list-style: none;
    margin: 0.4em;
    padding: 0;
    width: 12em;
    text-align: center;
  }
 
  article ul ul {
    margin: 0 0 0 1em;
    padding: 0;
    width: 10em;
    border: none;
  }
 
  article ul ul li {
    margin: 0.1em 0;
    width: 1em;
    font-size: 80%;
  }
 
  article a {
    display: block;
    padding: 0.4em;
    text-decoration: none;
    font-weight: bold;
    border: 2px solid black;
    border-radius: 16px;
    box-shadow: 0px 5px 10px white inset;
    /*color: brown; */
   /* background-color: royalblue;*/
  }
  article a:link,
  article a:visited {
    color: brown; 
    display: block; 
    padding: 7px 10px; 
    text-decoration: none; 
  }
 
  article a:focus,
  article a:hover {
    color: grey; 
     background-color: #F4FA58;
  }
article a:active {
  background-color:white;
}