Huddle Landing Page

Hello! I'm a noob trying to complete another challenge. I thought this one would be straightforward, but I experienced some difficulty creating the borders around the icons. Am I doing it right or should I just find icons that already have a border just like the ones in the design? Also, I feel like I have to do a lot of minute adjustments to the mobile layout. Is there any way I can do it more effectively? Thank you so much for your valuable input!