There's three substacks here, each of them creating one of the lines and stacked above each other via simple line breaks \\. Inside each of the substacks, we have a first line with the text in size \Huge, Serif font (\textsf) and italics (\textit). Then we have a second line of color , shifted up 2em units to lie over the first line by adding [-2em] right after the line break \\.