Duplicated Back-To-Top Button - php

Question

One of my websites, www.makememodern.com, is displaying duplicate Back-To-Top buttons on all browsers when it should be showing one.
footer.php
<div id="back-to-top">Back to Top</div>
CSS
#back-to-top {
position: fixed;
z-index: 1000;
bottom: 20px;
right: 20px;
display: none;
}
#back-to-top a {
display: block;
width: 40px;
height: 40px;
background: #E45323 url(http://makememodern.com/wp-content/uploads/2014/05/backtotop.png) no-repeat center center;
text-indent: -9999px;
-webkit-border-radius: 100px;
-moz-border-radius: 100px;
border-radius: 100px;
-webkit-transition: 0.2s all linear;
-moz-transition: 0.2s all linear;
-o-transition: 0.2s all linear;
transition: 0.2s all linear
}
#back-to-top a:hover {
background-color: #222222;
}
HTML shows:
<div id="back-to-top" style="display: block;">Back to Top</div>
I achieve my desired results when I erase from the HTML directly above, but I can't figure out how to change it permanently.

Answer 1

Looks like you have a syntax error on line 790 in the view source.
<p>Copyright © 2014 Make Me Modern LLC, All rights reserved. <a href=</p>
Looks like there might be an extraneous link tag <a href=
If for whatever reason the <a href= is intentional, then it needs to be completed.
The main thing is, you're missing a closing tag on that line.

Answer 2

Your CSS is generating a different image for every a tag.
I suggest you to put the background image inside the #back-to-top style
#back-to-top {
position: fixed;
z-index: 1000;
bottom: 20px;
right: 20px;
display: none;
width: 40px;
height: 40px;
background: #E45323 url(http://makememodern.com/wp-content/uploads/2014/05/backtotop.png) no-repeat center center;
text-indent: -9999px;
-webkit-border-radius: 100px;
-moz-border-radius: 100px;
border-radius: 100px;
-webkit-transition: 0.2s all linear;
-moz-transition: 0.2s all linear;
-o-transition: 0.2s all linear;
transition: 0.2s all linear
}
#back-to-top a {
display: block;
}
#back-to-top:hover {
background-color: #222222;
}