How to right-align a menu

I’m using Blocomo, a child theme of Twenty Twelve. I’ve been unable to get the nav menu to align to the right side of the page. (Note: I am making changes in Blocomo, NOT in Twenty Twelve.)

This is the site with the recalcitrant menu:
https://www.clickersolutions.com/wordpress/

And this is the menu-related CSS code in Blocomo:

.main-navigation {
	position: relative;
	Margin: 0em 0em;
	Height: 2em;
}

.main-navigation div {
	display: inline-block;
	margin: 0 auto;
	margin-right: 0px;
}

.main-navigation ul.nav-menu,
.main-navigation div.nav-menu > ul {
        float: right;
}

.main-navigation li.nav-menu,
.main-navigation div.nav-menu > li {
        float: right;
        position: relative;
}