Css Plus want to provide a simple and fast way to realize flexible layout based on flexbox modeling. This awesome css feature lets you specify a flexible container within which direct children can be also flexible and float as columns or rows.
Add this css file:
Whit css+ you can create flexible layout like this:
buttonbuttonbuttonbuttonMenu 1Menu 2Menu 3Menu 4... your stunning content ...options|options|options
Try on your phone: