Does 100% width include padding?

Width 100% expands the width and adds the padding. Then you can make the margins / padding anything you want and the element will not expand past its available width.

What is padding right in CSS?

Summary. The padding-right CSS property of an element sets the padding space required on the right side of an element. The padding area is the space between the content of the element and its border. Contrary to margin-right values, negative values of padding-right are invalid.

Does height 100% include margin?

100% means 100% of the container height – to which any margins, borders and padding are added. So it is effectively impossible to get a container which fills it’s parent and which has a margin, border, or padding.

How does CSS calculate padding?

Any margin or padding that has been specified as a percentage is calculated based on the width of the containing element. This means that padding of 5% will be equal to 5px when the parent element is 100px wide and it will be equal to 50px when the parent element is 1000px wide.

How can I increase my height at 100?

Try setting the height of the html element to 100% as well. Body looks to its parent (HTML) for how to scale the dynamic property, so the HTML element needs to have its height set as well. However the content of body will probably need to change dynamically. Setting min-height to 100% will accomplish this goal.

Can you use Calc for padding?

A solution for you would be to use CSS calc, it has good browser support and fixes your issue in quite a simple manner. The only downside here is that it doesn’t calculate the padding-top in % but you simply cannot calculate padding-top in % from the height of the element unless you use javascript.