Chat app illustration using CSS

Hello there! I've completed the illustration challenge finally because i faced some small issues. I would like to see your advices and suggestions. here is some problems i faced:

• changing the outline and the color of the radio button .
• making the second background illustration (the bottom left one) because it added an unnecessary scrollbar on the x axis when i made it, but i deleted it now .
• making the page shorter (removing the unnecessary white space on the bottom). Again your advices are welcomed, and thanks in advice !!