How can I center a custom HTML video on my homepage?

[ZenoPageBuilder]

Hello @GenuineEssiac

Inside Shopify Admin, you can go to Edit theme code, open file theme.css and add this code at the bottom

.custom__item--b4b3c958-c92e-41d3-816b-8bc7d7d7ee03 {
    margin: auto;
}

The result

Hope that helps!