Design with bootstrap elements, style them to your hearts content, then export to code.
Try it out
Open the left sidebar and drag some things into the red box below! Open the sidebar by clicking the >> icon.
Maybe try some buttons like these. You can use icons and snap them into the buttons.
Responsive Use bootstrap layouts and containers
Select one of the columns to the right and drag it's resize handles to resize it.
Right click to add more columns.
This page is responsive. Resize it to see things reflow!
The red borders mean it's empty. Drag something in there!