Place an image at the top of a DIV and center it

Question

I have 2 containers, one grey, one white. I\'d like to place an image (this will be a triangle down) to the very top of the white background and center it horizontally. How coul

Answer 1

margin:auto only works on block elements.

.triangle {
  margin: auto;
  margin-top: -80px;
  display: block;
}

(Your declarations for margin-left and -right are superfluous, since you are overwriting them with margin: auto on the next line anyway.)