Custom footer / add gradient to the footer

Hi,
I’m sorry for my english this is my second language. I’m new to WordPress. We have bought one of the themes and I have being trying to add a gradient to our footer. The theme provides a custom CSS option, but when I add this code to custom CSS and save it I don’t see any changes.

This is the code I added to my footer:

.footer {

background: #87e0fd;

background: url(data:image/svg+xml;base64,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);

background: -moz-linear-gradient(top, #87e0fd 0%, #3f93b5 38%, #012e3a 100%);

background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#87e0fd), color-stop(38%,#3f93b5), color-stop(100%,#012e3a));

background: -webkit-linear-gradient(top, #87e0fd 0%,#3f93b5 38%,#012e3a 100%);

background: -o-linear-gradient(top, #87e0fd 0%,#3f93b5 38%,#012e3a 100%);

background: -ms-linear-gradient(top, #87e0fd 0%,#3f93b5 38%,#012e3a 100%);

background: linear-gradient(to bottom, #87e0fd 0%,#3f93b5 38%,#012e3a 100%);

filter: progid:DXImageTransform.Microsoft.gradient( startColorstr=’#87e0fd’, endColorstr=’#012e3a’,GradientType=0 );

}
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The code I got from http://www.colorzilla.com/gradient-editor/

Any suggestions greatly appreciated,

Thank you,
Vik