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There is a font style as follows:

I want to add color to the heart instead of the entire span surrounding the heart having color
The wrong effect is as follows:

span is defined as follows:

<span class="iconfont">&#xe61a;</span>

If you add background-color, the effect shown in the picture above will appear. If you use color directly, only the heart-shaped border will have color. Now I want to realize that the inside of the heart has color.
Please give me some advice