The Out-of-box theme has predefined styling built into the CSS. This section describes some of the base elements in this CSS.
CSS Color Palette
Canvas Breakpoints
CSS breakpoints are points where the website content responds according to the device width.
The website Canvas Width has four sizes:
Header/Footer Breakpoints
The Header and Footers change at two points (768 px, 992 px):
Other Element / Page Breakpoints
Header Styles
Paragraph Styles
Link / Button Styles
More Information: