Link background is getting stuck after click.

[robzky]

Hello i would like to ask how do i remove background after click on the desired element.

HTML :
a class="hvr-rectangle-out" target="_blank" href="#"></a
(removed < > on purpose)
CSS:

.hvr-rectangle-out {
background: black;
&:link {
text-decoration: none;
}
&:focus {
background: black;
}
}

I've tried to delete :focus at hover.css file but it doesnt work. Is there any way to play this around?

(or atleast give the :focus state black color)