Source: dist/css/library_boot.css, line 8595
10.15.2 Section Header
Section Headers are styled the same
Example s
default
plan header
default
<header class="font_display font_regular c_primary-n1 m-b_3 lh_1 m-b_4:lg m-t_3 "><h2 class="lh_1 m_0 font_regular lowercase font_3:lg font_2:md font_1">[modifier]</h2></header>