Run this shell script with (sudo) root permissions to change your wlan0 MAC address to a randomly generated one. If you want to change your eth0 address, just replace all wlan0′s with eth0′s.
Border radius was introduced as a part of CSS3 standard, but some browsers don’t display round borders for images. This behavior can be expected, because -border-radius is intended to work on borders, not images. So here is a workaround for images:
A solution is to add a border around the picture, which is the same color as the background (in this case, black).