<style>
.file {
    position: relative;
    display: inline-block;
    background: #D0EEFF;
    border: 1px solid #99D3F5;
    border-radius: 4px;
    padding: 4px 12px;
    overflow: hidden;
    color: #1E88C7;
    text-decoration: none;
    text-indent: 0;
    line-height: 20px;
}
.file input {
    position: absolute;
    font-size: 100px;
    right: 0;
    top: 0;
    opacity: 0;
}
.file:hover {
    background: #AADFFD;
    border-color: #78C3F3;
    color: #004974;
    text-decoration: none;
}
</style>

<p style="text-align:center;">
<a href="http://www.saac.gov.cn/daj/hybz/201806/e8c3884e4b5a4231afb8d7f0b2622c40/files/97c160275c9a495baa66e4be33485b89.pdf" class="file"><input type="button" />&gt;&gt;&gt;&gt;请点击在线阅览&lt;&lt;&lt;&lt;</a> 
</p>