Minor CSS and javascript work on holiday villa website

General information for the website: holiday villa rental website
Description of requirements/features: Existing website requires the following minor changes:

1. CSS changes to property availability calendar html/css to further enhance look and feel. Calendar already presents as expected. Just needs tweaked to have better look and feel.

2. Requires help pop up box (on hover over or on click) for certain html forms or headers. Ideally using CSS and simple javascript.

3. Requires javascript pop up box when hover over booking in html availability calendar that shows the booking details. Html will be tweaked to support requirements.

This work requires work outside of the website i.e. we cant gibve ditrect access to the site but can give access to a proving instance of the site. All css and javascript code changes should be sent to myself and i will upload.

Attachments of potential examples of help pop boxes and also a view of what the calendar currently looks like.
Extra notes: