Unfortunately, that's telling your div to start halfway. Following your suggestion leaves me with an element with its top left corner in the exact center of the

Unfortunately, that's telling your div to start halfway. Following your suggestion leaves me with an element with its top left corner in the exact center of the containing div. I'm not a fan of CSS due to issues like this. It falls in the same line as issues where, for example, paddings and margins (and borders) are added to the size of your div rather than subtracted. There's a solution for that that makes sense nowadays but by the time that came about, I'd already stopped liking CSS.