For those of you who cannot read the code in that tiny box, here it is.
By updating it just now, I have made it so that you will really need to copy the entirety of this code to test your banner, because it now floats 25px to the right as it exists in the source.
.b_flood {
background: url("YOUR URL HERE") no-repeat left top ! important;
}
It should also be mentioned that this only works on The Flood board.