Changing the Background and Line Breaks

How can I set a background image or change the background color of my login page? Also, how can I put a line break between two sentences at the top of the login form?
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Changing the Background and Line Breaks

the CSS selector for the entire “card” is vaadin-login-overlay-wrapper::part(card) and for the blue part inside it vaadin-login-overlay-wrapper::part(brand)

as for the title, instead of just setting it as a string, you can set a component there, and that way put in a line break

this is a nice extension that helps with theming - https://chrome.google.com/webstore/detail/vaadin-theme-assistant/appljeomkgjhafplceofapmechoilnhb