Trying to customize header in Smart Theme

I am trying to place an image in the header similar to this site (https://nataliehodson.com/). I tried the following code in the additional CSS on appearance/customize:

#site-header {
background-image: url( ” https://kristencoleman.com/wp-content/uploads/2020/08/Ad-a-31.jpg” ) !important;
padding-top: 120px;
background-repeat: no-repeat !important;
background-size: 100% 65% !important;

The image did not appear. Do I need to go through the theme editor? What is the best and easiest option?

• This topic was modified 4 years, 7 months ago by Steven Stern (sterndata).

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