you can learn it within 1-2 hours, start with B4. If you want to lean more check the source code if it's css. Also check http://semantic-ui.com/ http://semantic

you can learn it within 1-2 hours, start with B4. If you want to lean more check the source code if it's css. Also check http://semantic-ui.com/ http://semantic-ui.com/ , it has more widgets and styles. follow UI/UX trends to see how things can be organize in different ways, Pinterest might help you to find/follow more designs.