Wondering if it is possible to change the submit, next and back button size with CSS/HTML?
Sure! Probably the easiest thing to do is to copy and paste this code into your Custom CSS and play with the padding to find the size you want:
padding: 10px 15px;
That’s the default padding for buttons and increasing the pixels will make the button bigger. The first number is for the top and bottom and the second number for left and right.
I hope that helps!