Adjust layout for components in all pages

[zxkevin]

As a fellow web surfer I want the information of the page to be viewable in all window sizes so that I can see the website on any device comfortably.

Acceptance Criteria:

• Most components scale to different window sizes.

Tasks:

• [x] Adjust layout for PostList page /Ari
• [x] Adjust layout for CreatePost page /Cyrus