Allow transparent background on cards

https://domo-support.domo.com/s/article/360043428433?language=en_US#:~:text=Changing%20the%20background%20color%20for,discussed%20in%20the%20previous%20section).

looks like you can change the background of cards or dashboards to 100% transparent, but having finer control over opacity (percent slider) might be nice!

"In Domo Stories, you can change the background color of Dashboards as well as cards. This is not possible in standard Dashboards. "

supposedly there's a feature in development at Domo that will allow finer control over dashboard design…