Your rule would actually work, except the item is as far right as the nav container will allow. To go further, the nav container width needs to be changed from max-width: 100%; to width: 100%; (line 918)

That still doesn’t quite get it for Volunteer because of the item padding. The padding-right value just for the Volunteer anchor link style needs to be set to zero.

.css( {
									'background-image' : 'url("' + src_item.attr( 'src' ) + '")',
									'background-size' : '100% 100%',
									'background-position' : 'center center'

Is that right? Sorry I am a noob ??

.main-navigation {
    float: right;
    max-width: 100%;
}

at 918 of wp-content/themes/radiate-pro/style.css. This is just for reference, don’t change this rule. Override it where ever you are placing your other custom rules. Try this override:

.main-navigation {
  width: 100%;
}

.main-navigation {
  width: 100%;
}
	
li.id menu_item_808 {
    Float: right;
}

and I don’t see a change?
Thanks for your help!