style titles of cart and checkout page

Dear community, dear support,

I’m struggling a bit with the “Cart” & “Checkout” page of the shop I’m setting up.

I was able to address the headings of both pages with CSS using the following CSS:

h1.entry-title {

1. font-size: clamp(16px,3vw,4vw);
2. font-weight: 700;
3. color: #000000;
4. font-family: “Open sans”;
5. text-decoration: lowercase;
6. }

Both headings don’t react to

font: “Open Sans”; and
text-decoration: lowercase;

Would be happy about any hint what I’m doing wrong!

Many thanks in advance!
neverdowork

The page I need help with: [log in to see the link]