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/* 如果元素的子集浮动，则无法撑大其父级，需要单独设置 */
li{
list-style: none;
width: 100px;
height: 40px;
border:1px solid #7f7f7f;
text-align:center;
line-height: 40px;
color:red;
float: left;
}
a{
/* 行元素转化为块元素 */
display:block;
width: 100px;
height: 40px;
text-decoration: none;
color:red;
}
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<ul>
<li><a href="">京东</a></li>
<li><a href="">阿里</a></li>
<li><a href="">腾讯</a></li>
<li><a href="">百度</a></li>
</ul>
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