Remove extra button spacing/padding in Firefox

Add this: button::-moz-focus-inner { padding: 0; border: 0 } Including the border rule above is necessary for buttons to look the same in both browsers, but also it removes the dotted outline when the button is active in Firefox. Lots of developers get rid of this dotted outline, optionally replacing it with something more …

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Spacing between flexbox items

The CSS spec has recently been updated to apply gap properties to flexbox elements in addition to CSS grid elements. This feature is supported on the latest versions of all major browsers. With the gap property, you can get what you want with just gap: 10px (or whatever size you want).

Spacing between thead and tbody

I think I have it in this fiddle and I updated yours: tbody:before { content: “-“; display: block; line-height: 1em; color: transparent; } EDIT better & simpler: tbody:before { content:”@”; display:block; line-height:10px; text-indent:-99999px; } This way text is really invisible