Zeroclipboard在悬停和活动时灰色按钮

Question

当您将鼠标悬停在我的按钮上时，它会变灰。当你点击它。我使用的是zeroclipboard v1.3.5 代码：Javascript

<script language="JavaScript">
$(document).ready(function() {

var clip = new ZeroClipboard($("#copy_button"), {
moviePath: "zeroclipboard/ZeroClipboard.swf"
});     
});
</script>

HTML

<p class="baddress">18b1bypQA52LdYBnth8sqt2zDvZVZStpZe <button class="btca"      id="copy_button" data-clipboard-text="18b1bypQA52LdYBnth8sqt2zDvZVZStpZe" title="Click to     copy me.">Copy</button></p>

CSS

.btca, .zeroclipboard-is-hover{
background-color: #61ff21;
border: 3px solid black;
border-color: #00ffff;
text-decoration: none;
color:gray;
font-weight: bold;
}
.btca:active, .zeroclipboard-is-active{
border-color: #61ff21;
background-color: #00ffff;
}