麻烦老师检查一下我的作业（盒子模型，4-7）

来源：4-7 编程练习

慕粉1470845848

2018-10-31 13:50:28

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>display属性</title>
        <style type="text/css">
          /*样式补充*/
          body,div,ul,h3{padding:0px;
              margin:0px;
          }
          ul{display:none;}
          h3{background:#e9e9e9;
              width:100px;
              border:1px gray solid;
              text-align:center;
              font-family:"宋体";
              padding:7px;
          }
          h3:hover~ul{display:block;
              text-align:center;
              width:100px;
              padding:7px 0px;
          }
          
        </style>
    </head>
    <body>
    <div class="big">
        <div class="div1">
            <h3>家电</h3>
            <ul class="elec">
                <li>冰箱</li>
                <li>洗衣机</li>
                <li>空调</li>
            </ul>
        </div>
        <div class="div2">
            <h3>洗护</h3>
            <ul class="wash">
                <li>洗衣液</li>
                <li>消毒液</li>
                <li>柔顺剂</li>
            </ul>
        </div>
        <div  class="div3">
            <h3>衣物</h3>
             <ul class="clothes">
                <li>衬衫</li>
                <li>裤子</li>
                <li>卫衣</li>
            </ul>
        </div>
      </div>
</body>
</html>

以及怎样才能把边框设置得那么细，怎样才能使ul和h3水平对齐

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