HTML
<a class="colorido" href="#">el enlace</a>
CSS
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background-image: -webkit-linear-gradient(left, #EA8711, #D96363, #73A6DF, #9085FB, #52CA79);
background-image: -ms-linear-gradient(left, #EA8711, #D96363, #73A6DF, #9085FB, #52CA79);
background-image: -o-linear-gradient(left, #EA8711, #D96363, #73A6DF, #9085FB, #52CA79); }
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