TechnicalwebCSS FrameworksOn this pageCSS Frameworks Core Bootstrap Foundation Bulma Semantic Materialize Skeleton Pico Themes NES Geo for Bootstrap Windows 98 Gradients 3-color-gradient Examples checker box background Thanks to: https://twitter.com/lyle/status/1395480240978161664?s=21 background: repeating-conic-gradient(#505050 0% 25%, #909090 0% 50%) 50% / 30px 30px;