CSS - Is there a way to get rid of the selection rectangle after clicking a link?

Do you mean the dotted outline of a target?

Try:

:focus {
    outline: 0;
}

This would remove all focus outlines. IT's essentially the same as onclick in JavaScript terms. You might prefer to apply this to a:focus.

Try adding this:

onclick="this.blur()"

Discussed here as well

(CSS?) Eliminating browser's 'selected' lines around a hyperlinked image?

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