A single em unit is equivalent to an element’s font size. So, for example, if an element has a font size of
14 pixels and a width set to 5em, the width would equal 70 pixels (14 pixels multiplied by 5).1 2 3 4 5 | .banner { font-size: 14px; width: 5em; } |
When a font size is not explicitly stated for an element, the em unit will be relative to the font size of the closest parent element with a stated font size.
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