calc() lets you do a simple calculation, for
CSS property values.
It can be used anywhere for a length or number.
width: calc(100% - 80px);
you can use any of the following operators:
+→ add. (must have space before and after)
-→ subtract. (must have space before and after)
*→ times. One of the argument must be a number.
/→ divide. The right-hand side must be a number.
Parentheses can be used for grouping.
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