Free HTML5/CSS3 WordPress 3.1+ Theme With Responsive Layout: Yoko
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In this post we are glad to present to you yet another freebie: a responsive WordPress theme Yoko which was designed by talented designers Ellen and Manuel from Elmastudio and released for the Web design community. Of course, the theme is absolutely free to use in private as well as commercial projects.
Yoko is a modern and flexible WordPress theme. With the responsive layout based on CSS3 media queries, the theme adjusts to different screen sizes. The design is optimized for big desktop screens, tablets and small smartphone screens. To make your blog more individual, you can use the new post formats (like gallery, aside or quote), choose your own logo and header image, customize the background and link color.
Source: Smashing Magazine