CSS Layout - width and max-width
Using width, max-width and margin: auto;
As mentioned in the previous chapter; a block-level element always takes up the full width available
(stretches out to the left and right as far as it can).
Setting the width of a block-level element will prevent it from stretching
out to the edges of its container. Then, you can set the
margins to auto, to horizontally center the element within its container. The
element will take up the specified width, and the remaining space will be split
equally between the two margins:
This <div> element has a width of 500px, and margin set to auto.
Note: The problem with the <div> above occurs when the browser window is
smaller than the width of
the element. The browser then adds a horizontal scrollbar to the page.
Using max-width instead, in this situation, will improve the
browser's handling of small windows. This is important when making a site usable
on small devices:
This <div> element has a max-width of 500px, and margin set to auto.
Tip: Resize the browser window to less than 500px wide, to see the difference between
the two divs!
Here is an example of the two divs above:
Example
div.ex1 { width: 500px; margin:
auto; border: 3px solid #73AD21;}
div.ex2 { max-width: 500px;
margin: auto; border: 3px solid #73AD21;}
Try it Yourself »
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Reference: https://www.w3schools.com/css/css_max-width.asp