diff --git a/openlp/core/lib/renderer.py b/openlp/core/lib/renderer.py
index c42a55741..ba4a5563e 100644
--- a/openlp/core/lib/renderer.py
+++ b/openlp/core/lib/renderer.py
@@ -22,6 +22,7 @@
 
 import re
 
+from string import Template
 from PyQt5 import QtGui, QtCore, QtWebKitWidgets
 
 from openlp.core.common import Registry, RegistryProperties, OpenLPMixin, RegistryMixin, Settings
@@ -371,22 +372,22 @@ class Renderer(OpenLPMixin, RegistryMixin, RegistryProperties):
         self.web_frame = self.web.page().mainFrame()
         # Adjust width and height to account for shadow. outline done in css.
         # TODO: Tested at home
-        html = """<!DOCTYPE html><html><head><script>
-            function show_text(newtext) {{
+        html = Template("""<!DOCTYPE html><html><head><script>
+            function show_text(newtext) {
                 var main = document.getElementById('main');
                 main.innerHTML = newtext;
                 // We need to be sure that the page is loaded, that is why we
                 // return the element's height (even though we do not use the
                 // returned value).
                 return main.offsetHeight;
-            }}
-            </script><style>*{{margin: 0; padding: 0; border: 0;}}
-            #main {{position: absolute; top: 0px; {format_css} {outline_css}}}</style></head><body>
-            <div id="main"></div></body></html>""".format(format_css=build_lyrics_format_css(theme_data,
-                                                                                             self.page_width,
-                                                                                             self.page_height),
-                                                          outline_css=build_lyrics_outline_css(theme_data))
-        self.web.setHtml(html)
+            }
+            </script><style>*{margin: 0; padding: 0; border: 0;}
+            #main {position: absolute; top: 0px; ${format_css} ${outline_css}}</style></head><body>
+            <div id="main"></div></body></html>""")
+        self.web.setHtml(html.substitute(format_css=build_lyrics_format_css(theme_data,
+                                                                            self.page_width,
+                                                                            self.page_height),
+                                         outline_css=build_lyrics_outline_css(theme_data)))
         self.empty_height = self.web_frame.contentsSize().height()
 
     def _paginate_slide(self, lines, line_end):
