Update phantomscript.js

attempt two at fixing the rendering issue

lib/phantomscript.js

@@ -254,11 +254,31 @@ function executeInPage(data) {
   mermaid.init();
 
   svg = document.querySelector('svg')
-  svgValue = xmlSerializer.serializeToString(svg)
 
-  // make sure the entire view area is calculated before exiting
-  // this solves an issue where the svg is not done rendering when the image is created
-  svg.getBBox();
+  var boundingBox = svg.getBoundingClientRect(); // the initial bonding box of the svg
+
+  // resizing the body to fit the svg
+  document.body.setAttribute(
+    'style'
+    , 'width: ' + (boundingBox.width * 1.5) + '; height: ' + (boundingBox.height * 1.5) + ';'
+  )
+  // resizing the svg via css for consistent display
+  svg.setAttribute(
+    'style'
+    , 'width: ' + (boundingBox.width * 1.5) + '; height: ' + (boundingBox.height * 1.5) + ';'
+  )
+
+  // set witdth and height attributes used to set the viewport when rending png image
+  svg.setAttribute(
+    'width'
+    , boundingBox.width *  1.5
+  )
+  svg.setAttribute(
+    'height'
+    , boundingBox.height * 1.5  
+  )
+
+  svgValue = xmlSerializer.serializeToString(svg)
 
   //console.log(document.body.outerHTML);