an><span class="o">.</span><span class="nf">apply</span><span class="p">()</span>

    <span class="c1">/// or, the light theme</span>
    <span class="c1">//ThemeManager.lightTheme.apply()</span>

    <span class="c1">/// or, the 'system' theme, which dynamically changes to light or dark, </span>
    <span class="c1">/// respecting *System Preferences &gt; General &gt; Appearance* setting.</span>
    <span class="c1">//ThemeManager.systemTheme.apply()</span>

<span class="p">}</span>
</code></pre>
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