The edited style is a visual effect used in Doki Doki Literature Club! starting in Act 2, applied on text. It's usually (though not always) accompanied by other visual oddities. Typically, it's used on text that would be thematically or otherwise out of place in Act 2.
The effect involves the text affected being rendered in a font called Verily Serif Mono and given a thick black outline, which can occasionally wrap in upon itself and leave artifacts of empty space.
A glitch can occur whereby text intended to be rendered in the edited style will be rendered in the normal style. This occurs when the game is saved during a line of edited-style text and loaded. This occurs because the variable which determines if text should be rendered in the edited style is not included in save files, and when loaded, the game automatically instances the variable with its default value, being the normal style.