Merge branch 'release/0.7.6' into develop
Removed legacy codes. Improved clear-fix.
Improved article-title ellipsis styles.
Fixed scroll-up button float problem.
Improved font-size control.
Introduced border-color variables.
Merge branch 'feature/style_improvement' into develop
Ready for version 0.7.7.
Merge branch 'release/0.7.7'