v6.0.0

Bug Fixes

• css: Update at2x to allow background-size: contain (#336)
• css: (breaking) Remove curve under hero component (#311)
• css: (breaking) Move Zilla Slab from default theme to custom theme (#342)
• css: Call Out component is missing display: flex vendor prefixes (#218)
• css: Decrease size of article h3 and h4s #293
• css: (breaking) Update protocol/tokens v3.0.0
• css: blockquote needs mzp-t-firefox theme #303
• css: Summary button text over laps icon #331
• css: Make summary and details widget styles into mixins #332
• css: Visited link colour in t-dark themes too dark #335