Various queries regarding css for posts

Dear Team,

Thanks for the great theme! Very potential.

I have been trying many permutation of tags to control the display of the posts, through css.

Example of a post: https://www.lilafoundation.in/2016/03/06/tao-life-appreciation/

A few features I would like to achieve:

1. Display of the entry-title section. I could satisfactorily affect background colour, font colour and padding-left, but I am not sure how to code for the height and bottom of this background to match that of the grey box indicating the date of the post (margin maybe?).

2. I would like to apply analogous features to the entry-title/page-header of all categories.

Example of a category page: https://www.lilafoundation.in/category/event-reports/

I have already satisfactorily coded something similar for page headers:

.page .page-header {
  background-color: #fcd00b
}

.page .page-header .entry-title {
  color: #ffffff;
}

.page .page-header .entry-title {
  text-align: center;
}

What would be the css tag for category header titles?

3. I would like to apply full-width and no side widget for all posts and categories and the main blog page (or for all the website, for that matter – but I have already settled the case of the Pages manually, case by case). For that purpose, all the basic css codes suggested elsewhere online did not work. Which are the right ones for this theme?

4. Lastly, are there display options for the posts in the main blog page, or in each category page? I mean, such a a display in rows of boxes, instead of the linear display as is by default, with one row for one post, and then the next one, etc.? My ideal choice would be for a series of boxes, thumbnail of the post, only the title under it and the excerpt below.

I hope that is not too much trouble… Else I can manage something with the options available.

Thanks a ton !

Samuel