Dev challenge using SASS, Flex, Grid and responsive

Hello guys ! I just finished this challenge, and I took a lot of pleasure to did it ! It was not easy. I didn't succeed to align the text section with the second article block, and I don't know why, the second aside bar is bigger than the first. I had a hard time to do the menu in mobile version, was my first time for this. I had to watch some videos and tutos but it's not perfect (oh no, very ugly lol). I didn't know how to do the left part (Should i use a div with "filter: blur"?) and for change the icon. If you have some tips, I take it ! I just have one question, my semantic is it correct? Have a good day !