def get_css
return "/* default fill styles for multiple datasets (probably only use a single dataset on this graph though) */\n.key1,.fill1{\n fill: #ff0000;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 0.5px; \n}\n.key2,.fill2{\n fill: #0000ff;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key3,.fill3{\n fill: #00ff00;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key4,.fill4{\n fill: #ffcc00;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key5,.fill5{\n fill: #00ccff;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key6,.fill6{\n fill: #ff00ff;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key7,.fill7{\n fill: #00ffff;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key8,.fill8{\n fill: #ffff00;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key9,.fill9{\n fill: #cc6666;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key10,.fill10{\n fill: #663399;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key11,.fill11{\n fill: #339900;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n.key12,.fill12{\n fill: #9966FF;\n fill-opacity: 0.5;\n stroke: none;\n stroke-width: 1px; \n}\n"
end