I would like to use the following calculation in the width and height of an element:
(1 / 0.65) * 100, then the % sign
So that the width & height are set to 153.85%.
However I believe the first number must have units, or be a percentage - in order for calc to work.
How can I set this in calc rather than hardcoding it to 153.85%?
153.85% being the reverse percentage of 65% - per this Math.SE question.
I tried calc(100% / 65%) but this was marked as invalid syntax.
You can convert the percentage into "raw" form, and then do your calculation:
calc((100% * 100) / 65);
(100% * 100) / 65 behaves consistently and correctly in css because it correctly manipulates units according to css rules. (100% / 0.65) uses direct division of a percentage by a unitless number and might not be supported by different browsers consistently. Also using the method shown above maintains the percentage throughout the calculation, whereas the latter does not.