input-groups button addons incorrect margin

[cadu-leite]

When buttons are used as "addons" to inputs the look wrong to.

and the problem seems to be the

.btn {
	background-image: none;
	border-radius: 0;
	margin-bottom: 5px;  // <<here. This is not the right way to have a space in inline element.
	line-height: 1.2;

the line in the repo is in https://github.com/modularcode/modular-admin-html/blob/8eba3bd436c/src/_common/button/button.scss#L4