Need a prestashop custom.css file for changing style of home page "custom text bloc" from classic theme

Hello

I need to prestashop / CSS specialist

Goal of this project is to provide custom.css file in order to format a html source in "Custom text block" of the classical 1.7.8.5
The CSS must only modify the style of the "Custom text block" not the others part of the website

The styles to import are in this page:
https://lapmonitor.com/test_html_page/home2.html

My website (custom html same as "home2.html" is at the end of the page, it is not styled/formated and need to be formated):
http://lapmonitor.com/presta_1_7_8_5_test

If required hml div ids can be changed

Thanks,
Franck