Adding a CTA button in the Admin Note section

Hi
I am unable to add a button (CTA) in the Admin Note section.
The code for the button:
<p style="text-align: center; font-size: 20px;"><a href="https://kriyayogajagat.com/community/?wpforo=signup">JOIN TODAY!</a></p>

CSS:

.classname {
	-moz-box-shadow:inset 0px 1px 0px 0px #ffffff;
	-webkit-box-shadow:inset 0px 1px 0px 0px #ffffff;
	box-shadow:inset 0px 1px 0px 0px #ffffff;
	background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #ededed), color-stop(1, #dfdfdf) );
	background:-moz-linear-gradient( center top, #ededed 5%, #dfdfdf 100% );
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#ededed', endColorstr='#dfdfdf');
	background-color:#ededed;
	-webkit-border-top-left-radius:6px;
	-moz-border-radius-topleft:6px;
	border-top-left-radius:6px;
	-webkit-border-top-right-radius:6px;
	-moz-border-radius-topright:6px;
	border-top-right-radius:6px;
	-webkit-border-bottom-right-radius:6px;
	-moz-border-radius-bottomright:6px;
	border-bottom-right-radius:6px;
	-webkit-border-bottom-left-radius:6px;
	-moz-border-radius-bottomleft:6px;
	border-bottom-left-radius:6px;
text-indent:0;
	border:1px solid #dcdcdc;
	display:inline-block;
	color:#777777;
	font-family:arial;
	font-size:15px;
	font-weight:bold;
	font-style:normal;
height:50px;
	line-height:50px;
width:145px;
	text-decoration:none;
	text-align:center;
}.classname:hover {
	background:-webkit-gradient( linear, left top, left bottom, color-stop(0.05, #dfdfdf), color-stop(1, #ededed) );
	background:-moz-linear-gradient( center top, #dfdfdf 5%, #ededed 100% );
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#dfdfdf', endColorstr='#ededed');
	background-color:#dfdfdf;
}.classname:active {
	position:relative;
	top:1px;
}

Interestingly, the same codes are working when on a localhost environment but not the live server. Am I missing out something? Could you please advise me accordingly?

Thanks in advance
BM

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