Use margin instead of the padding for sections

[YoshithaRathnayake]

Purpose

The purpose of this PR is to fix #1485

Goals

Using margin instead of the padding for sections

Approach

Replace the margin for paddings

Screenshots

Before

After

• See the top of the hero image to identify the change

Preview Link

https://pr-1582-sef-site.surge.sh/

Checklist

• [x] I have read and understood the development best practices guidelines
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas

Related PRs

## Learning

[YoshithaRathnayake]

How about now @anjula-sack ?

[YoshithaRathnayake]

@anjula-sack how about now?

[YoshithaRathnayake]

How about now? @anjula-sack

[YoshithaRathnayake]

I have fixed some spacing issues also @anjula-sack

[YoshithaRathnayake]

@Piumal1999 can you review this too?