Diete shop mobile single product

Mobile view is not good in diete theme
Specially  in single product page
https://ibb.co/n3jbxNk
 
The Quantities bottuns are not in row
And discribtion is not good 2
 
Please take a look at the linked image 
https://ibb.co/n3jbxNk
 
 
And if i want extra addon to my theme from where i can talk to sales person?
Prowaysupps.com