<p></p>
<p>Real CSS has a property like this:</p>
<div class="highlight highlight-source-css"><pre><span class="pl-c1">filter</span>: <span class="pl-en">invert</span>(<span class="pl-c1">1</span>) <span class="pl-en">hue-rotate</span>(<span class="pl-c1">180<span class="pl-smi">deg</span></span>);</pre></div>
<p>But since GTK+ CSS is not real/complete CSS, I doubt it works.</p>

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