An impressive job Mohammed, I love your design concept. I will however suggest you follow the header tag semantics rules and follow the accessibility rules. Follow the w3validator checker to correct that.
Great job implementing this project Mohammed> I will sujest that in the desktop version, you can make the background of the sticky header to be transparent so that it does not shed the contents of the page when scrolling .
Also, in the card section, where you have the speakers. The image alignment is not quite uniform so i sujest you use the span tag to attribute specific styling on the images.
An impressive job Mohammed, I love your design concept. I will however suggest you follow the header tag semantics rules and follow the accessibility rules. Follow the w3validator checker to correct that.