New features

• #3047 Flexbox helpers
• #3085 Add is-clickable helper
• #3086 Allow each component to have its own colors and default to global ones
• New variables $navbar-colors, $button-colors, $notification-colors, $progress-colors, $table-colors, $tag-colors, $file-colors, $textarea-colors, $select-colors, $form-colors, $label-colors and $hero-colors

Improvements

• #2630 Fixes #2598 -> Add $card-radius variable
• Add $card-overflow variable
• #2540 Fixes #2539 -> Fix indeterminate progress styling in IE11
• #3057 Make the default text color of $code listings more accessible
• #3088 Adds not allowed cursor to missing inputs
• #3101 Add $modal-breakpoint variable for modal breakpoint
• #3107 Add optgroup to generic.sass