Make transparent background related to theme

This is subjective, but given that the text overlaying is always black, I find the loss of contrast jarring. It's rough for legibility, especially in light themes. But note that this happens in both light and dark themes.



I would prefer something less dramatic. The darkness is misleading. Perhaps this would involve special-casing rgba values with an `a` value of `0`? Or just make the img tile itself more transparent, to show more of the theme's base color?

Thanks for a great tool!

查找在 UI 中渲染透明背景网格的 CSS 或 CoffeeScript 代码，可能位于样式表或视图文件中。issue 建议调整 alpha 为 0 的 rgba 值的透明度，或让图像网格更加透明。通过使用 pigments 包重新加载 Atom，并检查浅色和深色主题中的颜色显示来测试更改。

由索引模型根据 Issue 内容生成。