Ionic
From IThemes Codex
Edit the theme's style.css.
Change
.builder-module-navigation { font-size: 1em; background: transparent url('images/nav-bg.png') bottom; display: block; width: 99%; margin: 0em auto; }
to
.builder-module-navigation { font-size: 1em; background: transparent url('images/nav-bg.png') bottom; display: block; width: 100%; margin: 0em auto; }
and
.builder-module-navigation ul { float: left; display: block; background: url('images/nav-top-shadow.png') repeat-x; margin: 0; padding: 0; width: 99%; }
to
.builder-module-navigation ul { float: left; display: block; background: url('images/nav-top-shadow.png') repeat-x; margin: 0; padding: 0; width: 100%; }
Thanks to Dana.