Sandbox
This is a "warning1"...
The warning sign is scaled to the size of the text indent and centred in the left margin.
Hope it looks OK.
Blah blah blah. Rhubarb rhubarb rhubarb.
Whoops it overflowed.
"warning1" again...
But smaller.
This is a "warning2"...
The text overlays the image.
Again, size is important...
This is a "warning3"...