Thanks for getting in touch with us. My name is Muhammad and I will be your support rep.
I have fixed the slider text issue on the mobiles. I have edited the slider in mobile mode and decreased the slider title font size from the style settings, please see here: https://share.getcloudapp.com/wbu9b7Op
The issue with the form is appearing because of the below code in your additional CSS section. Do you want me to make it for large screens specifically because doing so will fix the issue?