"Tablets, desktops, smartphones, laptops, minis: we live in a world of screens, all of different sizes. Library websites need to work on all of them, but maintaining separate sites or content management systems is resource intensive and still unlikely to address all the variations. Experienced responsive web developer Reidsma, named ""a web librarian to watch"" by ACRL's TechConnect blog, shares proven methods for delivering the same content to all users using HTML and CSS. His practical guidance will enable web developers to save valuable time and resources by working with a library's existing design to add responsive web design features. Firmly addressing the expectations of library website users, he shows how libraries can build one site for all devices--now and in the future--with just HTML and CSS.