Line Block - Any way to delete/eliminate them?

I'm having an issue trying to "mask" or make horizontal line blocks on my website landing main page and shop so the page looks cleaner and minimalistic:

Basically I want to get rid of the thin horizontal line on the top of my shop page.  If possible, I would also like to eliminate or mask the small "SHIRT" (product category) at the top as well.

Any suggestions would be welcome - thank you.

Add to Design > Custom CSS

/* remove shop grey line */
.tweak-products-category-title .products.collection-content-wrapper .nested-category-title.nested-category-title-padding:after {
    display: none;
}

If it doesn't work, please share link to your site, we can check easier