Hi Chelsy Ann Koshy
I would suggest you follow this pattern to adding CSS code in the Dashboard page as the ID changes as per the block location on the user's dashboard.
Add the HTML block to the dashboard page using Reset Dashboard for all users setting. Once the HTML block is added to all the users, inspect the element on your dashboard page and add relevant CSS code to Edwiser RemUI general settings > Custom CSS section.
I would suggest you follow this pattern to adding CSS code in the Dashboard page as the ID changes as per the block location on the user's dashboard.
Add the HTML block to the dashboard page using Reset Dashboard for all users setting. Once the HTML block is added to all the users, inspect the element on your dashboard page and add relevant CSS code to Edwiser RemUI general settings > Custom CSS section.