Adjusting Slide Appearance in Microsoft PowerPoint 2013
Working with themes
Themes in PowerPoint provide a suite of design settings and style definitions that give your slides a consistent look and feel. You can apply a theme in a single action, putting in place background graphics, colors, fonts, and effects. The gallery of themes located on the Design tab helps you preview and choose the best look for your presentation. You can further adjust the look of a presentation by choosing another color combination in the Variants group.
Change the theme
On the ribbon, click the Design tab.
In the Themes group, click the More arrow in the Themes gallery.
Move your mouse pointer over a theme to see a preview of it applied on your slides.
Right-click a theme. On the shortcut menu that opens, click one of two options:
Choose Apply To All Slides to apply the theme to every slide in your presentation.
Choose Apply To Selected Slides to apply the theme only to the currently selected slide or slides.
In the Variants group, move your mouse pointer over a thumbnail to see a preview of its colors applied to the current slide.
Click the variant thumbnail to apply the colors to the slide.