css px code example

Example 1: css %-px

/*Only works on Modern browsers, make sure to include the spaces
around the operator.*/
width: calc(100% - 100px);

Example 2: css em

em -> Relative to the font-size of the element 
(2em means 2 times the size of the current font)

Example 3: em css

/*realative to the font-size*/