All `<img>` tags in Safari have a little gray border around them... <img width="174" alt="screen shot 2016-04-13 at 11 15 30" src="https://cloud.githubusercontent.com/assets/816856/14490150/11096d6c-0169-11e6-9d64-316abd606059.png"> There's some info in [this SO question](http://stackoverflow.com/questions/4743127/chrome-safari-display-border-around-image), but I think the quickest way would be to change to a div, because we set the image via CSS anyway it seems.