Update css

Author: accgit

src/css/style.css

@@ -4,13 +4,15 @@
 */
 @import url(https://cdnjs.cloudflare.com/ajax/libs/normalize/7.0.0/normalize.min.css);
 @import url(https://css-ui.github.io/css/cssui.min.css);
+@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,600,700&subset=latin-ext);
 @import url(style.tooltip.css);
 
 /*
     elements
 */
 body {
     background-color: #f2f2f2;
+         font-family: 'Open Sans', sans-serif;
 	     padding: 10px 10px 0;
 }