Testimonials and contact us form is not shown on mobile

Hello,
I have been working so hard to modify Zerif Lite to suit my needs but I stopped at this level .

I have question that I spent 1 hour trying to do which is making Send Message button in the centre not on the right side in the contact form

Here is my website
https://www.glutenfree421.com

Another question,
I want to replace the left big side title to have features instead of big text. How can I do that? In other words, I would like to have features on the right hand side and also on the left hand side.