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2021 design course 100% width on images not working

I’m on day 7 of the design course, and I have 2 issues.

  1. When I add 100%width to the images, it becomes terribly big.

  2. When I select the nav bar and click ‘open menu’, menu does not open.

Here is my site Read-Only:
https://preview.webflow.com/preview/2021-design-portfolio-course-563e12?utm_medium=preview_link&utm_source=designer&utm_content=2021-design-portfolio-course-563e12&preview=f61ed5793ff3d02cef4bb4c759b6b4fd&mode=preview