margin-bottom - CSS: Cascading Style Sheets | MDN - form margin bottom

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Bottom margin issue with Chrome vs IE - HTML & CSS - The SitePoint Forums form margin bottom


Margin Collapse. Top and bottom margins of elements are sometimes collapsed into a single margin that is equal to the largest of the two margins. This does not.

With CSS, you have full control over the margins. There are properties for setting the margin for each side of an element (top, right, bottom, and left).

I suggest you to use http://getbootstrap.com/css/#forms-horizontal form-group">