Add two buttons on the lower right corner, one button to the bottom and one button to the top

[akitten-cn]

Add two buttons on the lower right corner, one button to the bottom and one button to the top. I modified it casually.

<a id="up" href="#UU" style="display: inline-block;border-radius: 50%;position: fixed;bottom: 15%;right: 5%; text-decoration: none;font-size: 20px; color: #77ac98; z-index:9" >by胖橘↑</a>

<a id="down" href="#DD" style="display: inline-block;border-radius: 50%;position: fixed;bottom: 10%;right: 5%; text-decoration: none;font-size: 20px; color: #77ac98; z-index:9" >by胖橘↓</a>
<a id='UU' ></a>

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<a id='DD' ></a>