I have a large CSS file for which I would like to add !important to every CSS property. Is there one-line shortcut to make a whole .css file !important
If your goal is to override styles by importing another stylesheet, you should use the order of precedence.
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Here the style.css is the original and style-override.css would contain your new custom css. These styles will override the styles from style.css. This means you won't need to use !important because the style is overwritten.
Alternatively you could add in a CSS reset to remove all styles and build on-top of that.
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Check out a CSS reset at http://meyerweb.com/eric/tools/css/reset/ and add it to reset.css.