How can I modify the border radius on a Dawn theme image banner box?

[xibby]

Hi, I have this website and the image banner with the box that holds the text “The heat is here.” and the button. I want to make this box round but I can not find the place in the code where I can edit it with border-radius. I am using Dawn theme. Any help would be appreciated. My website is heatflags.com and the password is tweert.

[ThomasBorowski]

Open assets/section-image-banner.css on the code editor and add the following code to the styles for .banner__box:

border-radius: 5px;

Afterwards the code should look something like this:

Adjust the value to your liking.