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<p>I'm designing an app in electron so I can access CSS variables. I defined a color variable in <code>vars.css</code>: </p> <pre class="brush:css;toolbar:false;">:root { --color: #f0f0f0; } </pre> <p>I want to use this color in <code>main.css</code> but apply some transparency: </p> <pre class="brush:css;toolbar:false;">#element { background: (somehow use var(--color) and set some transparency); } </pre> <p>How do I do this? I'm not using any preprocessor, just CSS. I'd prefer a pure CSS answer, but I'm also open to JavaScript/jQuery solutions. </p> <p>I can't use <code>opacity</code> because I'm using a background image that shouldn't be transparent. </p>

:root {
  /* #f0f0f0轉(zhuǎn)換為十進(jìn)制RGB */
  --color: 240, 240, 240;
}

body {
  color: #000;
  background-color: #000;
}

#element {
  background-color: rgba(var(--color), 0.8);
}

<p id="element">如果您能看到這個(gè)，說明您的瀏覽器支持自定義屬性。</p>