Need to Make Background Transparent in GP Hooks

I have a new website at https://longfarms.ca

I have added a video in GP Hooks but the background is black. I can change the colour of the background with custom css as follows:

.video-js {
background-color: #0c5702;
}

but if I replace the colour with “transparent” it goes black again. I want the background image to show instead of the black. I could do it with Background Images settings if it were in the regular header but it is in GP Hooks After Header.

Would appreciate it if you could tell me how to make the background image show through.

Thanks!