Update styles.css

Author: CodeHimBlog

css/styles.css

@@ -1,5 +1,5 @@
 /*! Color themes for Google Code Prettify | MIT License | github.com/jmblog/color-themes-for-google-code-prettify */
-.prettyprint {
+pre.prettyprint {
   background: #1d1f21 !important;
   font-family: Menlo, "Bitstream Vera Sans Mono", "DejaVu Sans Mono", Monaco, Consolas, monospace !important;
   border: 0 !important;