Virtue Theme – Remove bottom line under page title

Hello! I am using the free download of the Virtue theme. I would like to remove the bottom line under the page title and close up the space a little between the page title and the images/description section. I’ve tried adding the following code to the custom.css but it’s changed nothing.

‘.page-header {
border-bottom: 0px;
display: none;
}’

Can you please tell me how to remove this line and close up the space? Here is my site:
https://www.madmangoes.com/sandbox