You're missing the required type attribute from that tag.
Anyway...
Specify a new class in the CSS that overrides it:
Code:
div.nooverride table {background-color: #0072bc;}
div.nooverride th {background-color: #0072bc;}
div.nooverride td {background-color: #0072bc;}
div.nooverride {color: white;}
... and wrap the script in that div:
Code:
<div class="nooverride"><script src="http://donatemeter.com/showbutton.php?i=281&item=27&width=170&direction=vertical&showtop5=yes&background=0072BC&graph1=red&graph2=maroon&text=white" type="text/javascript"></div>
Oh, and points are a bad choice for onscreen meaurements. They're a real-world size, and as such will vary greatly onscreen.
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