Update style.css

'Header Sytles' typo
Update _base.less

Fixed typos
Update _768up.less

Fixed typo
Merge pull request #385 from richbrill/patch-1

Update style.css
Merge pull request #388 from richbrill/patch-5

Update _768up.less
Merge pull request #387 from richbrill/patch-4

Update _base.less
merged changes from upstream