diff --git a/lib/phantomscript.js b/lib/phantomscript.js
index 12a73c625..8e2a26f7a 100644
--- a/lib/phantomscript.js
+++ b/lib/phantomscript.js
@@ -90,8 +90,9 @@ files.forEach(function(file) {
   })
 
   oDOM = oParser.parseFromString(svgContent, "text/xml")
-
+  
   resolveSVGElement(oDOM.firstChild)
+  setSVGStyle(oDOM.firstChild, options.css)
 
   // traverse the SVG, and replace all foreignObject elements
   // can be removed when https://github.com/knsv/mermaid/issues/58 is resolved
@@ -184,6 +185,13 @@ function resolveSVGElement(element) {
   }
 }
 
+function setSVGStyle(svg, css) {
+  if (!css || !svg) {return}
+  var styles=svg.getElementsByTagName('style');
+  if (!styles || styles.length==0) { return }
+  styles[0].textContent = css;
+}
+
 function resolveForeignObjects(element) {
     return;
   var children