Pod landing page [harder than I thought!][html/css form validation]

Hi everyone :)

I am amazed at how varied all these challenges can be, hence pretty much always making us work on different and new things. On completing this challenge I would specifically like to thank Frontend Mentor for the endless opportunity to practice, train and get better.

More context on the github repo.

My questions are:

• On the subject of modifying the color of svg elements without having to copy paste the whole svg code into html markup in order to access the fill property with css, that I find cumbersome : do you have any resources on the subject that could enlighten me.
• Also, I did get through quickly on the matter of styling the background image on mobile view and did not quite matched the expected design with my use of background-blend-mode property. Any advice on that part?

Thanks!