Pure CSS Checkbox & Radio Button Replacement For Bootstrap – icheck
icheck is a CSS extension for Bootstrap that allows you to apply custom styles to the default checkboxes and radio buttons.
CSS & CSS3
Modern CSS Framework For Documentation Pages – Whiteprint.css
Whiteprint is a responsive, flexible, modern, clean CSS/SCSS framework for documentation web pages.
Create Elegant Alerts And Notices Using Pure CSS – Alerts.css
Alerts.css is a CSS only alerts component which helps you create elegant, responsive, dismissable alerts and notices with custom icons, position, colors, and sizes.
0.5kb Responsive CSS Grid Framework – SMART CSS GRID
SMART CSS GRID is an ultra-light (~0.5kb minified) CSS grid framework to create responsive, flexible, fluid, 12-column grid layout for your modern web app.
Mobile-friendly Modal Window In Pure CSS – modal_box
Just another CSS library that makes it easier to create modal windows for both desktop and mobile devices.
CSS Only Static Modal Window
Yet another CSS solution to creating Bootstrap style modal windows that load content from inline html.
Extra Styles/Colors For Bootstrap 4 Buttons – button.css
button.css is a CSS extension for the latest Bootstrap framework that adds more styles, animations, and colors to the regular Bootstrap buttons.
Create Metro Style Tiles With Pure HTML/CSS – metroStyles.css
metroStyles.css is a small CSS library to create a Windows 10 Metro-style tiled menu with plain HTML and CSS.
Automatic 3D Image Rotator With Pure CSS
This is an automatic 3D image slider/slideshow/carousel/rotator with zoom-on-hover and pause-on-hover support, built with pure CSS and CSS3.
Weird CSS3 Animation Library – Woah.css
The Woah.css library enables you to apply eccentric, fun and showy CSS3 powered animations to html elements.