#+ATTR_HTML style="center"
[[/path/to/img.png]]


#+ATTR_HTML align="center"
[[/path/to/img.png]]

#+begin_center
[[/path/to/img.png]]
#+end_center

<p align="center"><img src="images/wim-128.png" /></p>

#+ATTR_HTML: :style margin-left: auto; margin-right: auto;
[[/path/to/img.png]]