Perplexing white space

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Hey, I added horizontal scroll for my portfolio section called My process. But the horizontal scrolling is creating white space, any help is appreciated.

P.S: I did add overflow hidden.

https://preview.webflow.com/preview/khan-ayans-spectacular-site?utm_medium=preview_link&utm_source=designer&utm_content=khan-ayans-spectacular-site&preview=6c3c7da0f3f89cb4a64e778cfaff1f95&workflow=preview