Subtheme Variables
@main_accent_color:
- borders on breadcrumb
- border on top of sidebar
- border on video scrollers
- border on related media inside articles
- header text on subscribe block
- poll results bg color
@block_header_txt_color:
- Text on headers (aka "block-title")
@highlighted_block_header_bg_color and @button_bg_color:
- Internet explorer doesn't doesn't show gradients so it needs a fall back bg color
