Ninja Forms Version 2.5.1 (no additional Ninja extensions) / Tempera V 0.9.8 / WordPress 3.8.1 / tested in Safari, Chrome mac and IE8 Windows:
All form fields are extending beyond the right margin when form label position is placed “Above Element”. If form label position is “Left of Element” or Right of Element” form fields display correctly. Regardless of Tempera default template pages uses to display form (one or two column layout). Adding the Custom CSS “.ninja-forms-cont {
width: 90%;
}” to Tempera Settings > Miscellaneous Settings has no effect on this display bug.
Display issue is fixed when Ninja form pages are viewed in alternate theme such as “Twenty Fourteen”