Don't hide the submit button in search forms
Refresh form styles

No major changes.

The input size classes has been removed as they weren’t used anywhere
in the theme
Rename the btn-state mixin and rename the color parameter
Rename the font shorthand mixin

.set is shorter than .shorthand
Don't use bold text in buttons
Minor button style changes
Move the comment form styles to comments.less
Use Flexbox to make room for the search submit button
Hide the search submit button in the topbar

Except when the mobile menu is active
Use default line-height on the dropdown toggles