引导4:按钮对齐文本与图标

So I'm making a button with an icon on the left. And the alignment is messed up. My text doesn't middle align with the icon and I have no idea how to fix this. Line-height doesn't seem to do anything. Or touching the padding/margins because I've added the padding to the icon area because I need it to be darker than the text background.So I'm making a button with an icon on the left