PIM-3134: fixing less files and changed to use bootstrap grid system

| Q                    | A
| -------------------- | ---
| Bug fix?             | No
| New feature?         | Yes
| BC breaks?           | No
| CI currently passes? |  Yes
| Tests pass?          | Yes
| Scenarios pass?      | Yes
| Checkstyle issues?*  | No
| PMD issues?**        | No
| Changelog updated?   | No
| Fixed tickets        | PIM-3134
| Doc PR               |