Simplest way to put the banner

How can I make it in these places?

Normal I can use here only html but probably it can work well only on my computer (screen resolutions) - Should I use too css?

Or I can use another metod?

I'm sorry, your question did not make any sense to me. Care to try again?

I need have here two banners/pictures.

1. About shipping.
2. About payment.

Like on picture:

This is the site footer. Just edit views/box_site_footer.inc.php.

I know where.
I don't know - how can I do it properly (with css or without css)?

Do you need someone to write you the HTML code for images to be shown?

No, only picture.
I see problem with resolution.

It can be insufficient.

See the documentation how to form an img tag.

https://www.w3schools.com/tags/tag_img.asp

Ok 

But it is constant?

I can check it here.
"Main content" have 713 px width.
But it is always 713 px?

Desktop and mobile view?

For dynamics you can use the bootstrap grid system (e.g. col-md-6, etc) and the img-responsive class.

Both w3c an bootstrap's official website have documentation for this.

For alignment there are the classes text-center, text-md-center...