I'm having issues with the CSS calc() function and CSS minifier. In my source .css file, I have variable
margin-left: calc(15px - 20%);
However, when the source file is translated with the minifier, I get the output
margin-left: calc(-20%+15px);
And that value cannot be read properly in the web browser - all I can see in Chrome dev options is margin-left: calc(-20%+15px);, with the warning sign next to it saying "Invalid property value".
How can I avoid that, maybe write calc() function in different way to fix this issue? Changing places of variables in the source .css files doesn't make any changes, and I don't have an option to use different minifier.