Bootstrap on Twitter: "We'll be bringing CSS variables to more components in each minor v5 release to make customization easier and even reduce file size in some cases. Consider this before and
Working with Bootstrap Framework in CodeLobster IDE
Buttons Inverse or Transparent Bootstrap
Bootstrap Buttons with Examples - GeeksforGeeks
Bootstrap Button Component · CoreUI for Bootstrap
Using Bootstrap With React Application | by shrey vijayvargiya | Geek Culture | Medium
Bootstrap buttons tutorial - sizes, colours and more