User picture css

[emmarichardson]

I am not quite sure why the following css is in place:
.block .content .userpicture {
width: 16px;
height: 16px;
margin-right: 6px;
}
But I have a login logout block that is now picking up this css and shrinking the user picture so that it is too small to see. Also previous Elegance theme, applied a nice rounding to this image.

I can fix this with css on my site but have a feeling that that css might mess with some other blocks as well...