As a designer, I find it completely ridiculous that we can't type in or paste a HEX code under the "Advanced" tab to change the background color of the new landing pages. This is such a basic functionality.
Thank you for bringing this to our attention! I can understand how important it is to customized items in your account to match your branding. After reaching out to our advanced level of support for further assistance, we were able to determine this is a defect you are experiencing. I apologize for any inconvenience this may be causing! In the meantime we have added you to our queue to be notified when this is resolved and suggest continuing to pick the closest matching color you can.
Thank you for bringing this to our attention. I can however see you were able to connect with our chat support about this as well. They added you to our queue to be notified and even suggested the workaround of picking the closest matching color you can. I apologize for any inconvenience this may cause! Please let us know if there is anything else we can assist with in the meantime.