OpinionCamp gives you plenty of design controls, so your polls can match your site. You will find them in the block settings, mostly under the Styles tab.
Choose the overall look. Default is included in the free version. Modern Card is part of OpinionCamp Pro. See Using the Modern Card style.
Set colors separately for each part of the poll: the poll itself, the vote button (including hover colors), the results, the success message and the closed poll banner.
Change the font size, weight (from Thin to Black), and letter case (uppercase, lowercase or capitalize) for the title, the description and the option labels.
Add a shadow around the poll, round its corners, change the border, and adjust the padding and margins.
Show choices in a single list or side by side: Horizontal, 1 Column, 2 Columns or 3 Columns. You can set this separately for desktop, tablet and mobile.
Change the button text, colors, corner rounding, alignment and Button Width.
Happy with the look of one poll? Use Copy styles in the block toolbar, then select another Poll block and use Paste styles. Only the design is copied, not the question or the choices.
You can show a small Powered by OpinionCamp link under the poll. It is off by default, so it only appears if you turn it on.