I found the user icon close to the user name on the top right of the forum is distorded when accessing the forum from an iPhone (a 3GS runing iOS 6).

Solution :

In common.css under ./styles/prosilver/theme, add this (in red below) :

[quote].header-avatar img

{ margin-bottom: 2px; max-height: 20px; [b][color=#FF0000]max-width: 20px;[/color][/b] vertical-align: middle; width: auto; }

[/quote]

See here for image.

https://www.phpbb.com/customise/db/style/pbtech/support/topic/138131

Fred