Stuck with the portfolio page

I’m a little bit stuck. Need some help.
I have to said that i don’t want to use bootstrap for my portfolio page, so i use flexbox.

I have a problem with my portfolio page.I don’t understand what is the blank space is on the right side of the web-page. Maybe it’s because i use “box-shadow” for pseudoelement “#about::before” Please, help me to remove it.
My portfolio page

@media screen and (max-width: 1200px)
input.btn {
margin: 0.4em 60%;

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Thank you for help, I just knew that there was a problem with margins:slight_smile:

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