Source: dist/css/virtual_boot.css, line 9991
12.17.1 Program Borders Inside
CSS Classes on the Article tag of all program elements
Example
Default styling
br_1 br-b_0 br-tr_radius br-tl_radius br_solid br_black-3 flex flex_column font_ui m-t_n2 relative
br_1 br-b_0 br-tr_radius br-tl_radius br_solid br_black-3 flex flex_column font_ui m-t_n2 relative