12 High-Quality Free CSS Button Libraries & Frameworks – Speckyboybttn.css Library bttn.css is a collection of lightly-styled buttons that feature different shapes, sizes, and colors. All styles can be called with simple class names. With the minified CSS file coming in at just 4kb, this library is also quite lightweight. CSS Buttons Collection The title may be simple, but Buttons is a library with over 20 collections of styles to choose from. Standouts include
