KSML theme fix

Fix backdrop issues during adding lb embed comments
LB-1139 : Embed show the texts overlapped

Remove mobile styling for the theme as the site itself isn't responsive.
This styling was reproducing issues on ipad,.
Port KSML changes to KSML-light
KSML themes update
Merge pull request #599 from nidzix/master

KSML lb embed theme update