Five ways to put the deadline, the limited-access mechanic, the button and the access code together. Same four pieces of information in every one, real email markup, shown with the panel above and the race-format rule below so they are judged where they sit. Pick a letter.
Rules and no boxes, with the blue outline the code carried before. The doubled hairline under the deadline is gone: the race-format rule below is now the only divider.
The same, with the code in a solid panel matching the info panel at the top. Heavier, and it rhymes with the block above it.