Grey box in each category

Travelify
1

I have one more question.

How to remove Grey box (make it white/invisible) and change fonts, the rectangle box with category name above a post when I click each categories?

Thank you for your support in advance!

2

This code will hide background and border

.page-title-wrap {
    background: none;
    border: none;
}

And this will hide the entire title section. So you can choose which solution is for you.

.page-title-wrap {
    display: none;
}