[Theme: Make] Can't move button in navigation bar

Hello, I’m trying to set up my navigation bar with a subscribe button that is an image I added through a plugin. I want to have it above my ‘Donate’ link in the menu but for some reason I can’t move past a certain point in the navbar. I can move it left but once I try to move it right it stops moving after its current position (if I use margin-right), or it adds white space to the bottom of the navbar and becomes a lot smaller and goes into the right corner without moving (if I use margin-left).

This is what I have right now:

li#menu-item-1197 {
	margin-right: 10%;
	padding-right:3px;
}

Thank you!

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