I can show you how we did ours, copying and pasting the entire file wouldn't really work too well :D.

In extra.css we have:
   display: inline-block;
   margin-top: -5px;
   padding: 0px 4px;
   font-size: 12px;
   border-radius: 3px;
   vertical-align: middle;
background: rgb(53,106,160); /* Old browsers */
background: -moz-linear-gradient(top,  rgba(53,106,160,1) 0%, rgba(32,81,114,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(53,106,160,1)), color-stop(100%,rgba(32,81,114,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top,  rgba(53,106,160,1) 0%,rgba(32,81,114,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top,  rgba(53,106,160,1) 0%,rgba(32,81,114,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top,  rgba(53,106,160,1) 0%,rgba(32,81,114,1) 100%); /* IE10+ */
background: linear-gradient(to bottom,  rgba(53,106,160,1) 0%,rgba(32,81,114,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#356aa0', endColorstr='#205172',GradientType=0 ); /* IE6-9 */
color: white; !important;
text-shadow: 0px 1px 0px #000;
border: 1px solid #224C6D;

Then when you edit the prefix, you set the custom class, "Other, using custom CSS class name:"
pe_prefix pe_core

You can use a generator like this:


To get the gradients, then just change the border colors/box-shadow inset(small line at the top).

I hope that helps!

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