ul {
 
    /* 取消ul預設的內縮及樣式 */
    margin: 0;
    padding: 0;
    list-style: none;
  }
 
  ul.drop-down-menu {
    border: #ccc 1px solid;
    display: inline-block;
 
    font-family: 'Open Sans', Arial, sans-serif;
    font-size: 32px;
  }
 
  ul.drop-down-menu li {
    position: relative;
    white-space: nowrap;
    border-right: #ccc 1px solid;
  }
 
  ul.drop-down-menu>li:last-child {
    border-right: none;
  }
 
  ul.drop-down-menu>li {
    float: left;
    /* 只有第一層是靠左對齊*/
  }
 
  ul.drop-down-menu a {
    background-color: rgb(72,61,139);
    color: rgb(252, 247, 247);
    display: block;
    padding: 0 30px;
    text-decoration: none;
    line-height: 40px;
  }
 
  ul.drop-down-menu a:hover {
    /* 滑鼠滑入按鈕變色*/
    background-color: #cf5c28;
    color: #fff;
  }
 
  ul.drop-down-menu li:hover>a {
    /* 滑鼠移入次選單上層按鈕保持變色*/
    background-color: #cf5c28;
    color: #fff;
  }
 
  ul.drop-down-menu ul {
    border: #ccc 1px solid;
    position: absolute;
    z-index: 99;
    left: -1px;
    top: 100%;
    min-width: 180px;
  }
 
  ul.drop-down-menu ul li {
    border-bottom: #ccc 1px solid;
  }
 
  ul.drop-down-menu ul li:last-child {
    border-bottom: none;
  }
 
  ul.drop-down-menu ul ul {
    /*第三層以後的選單出現位置與第二層不同*/
    z-index: 999;
    top: 10px;
    left: 90%;
  }
 
  ul.drop-down-menu ul {
    /*隱藏次選單*/
    display: none;
  }
 
  ul.drop-down-menu li:hover>ul {
    /* 滑鼠滑入展開次選單*/
    display: block;
  }
 html{
  background-color: rgb(215, 251, 254);
 }