--- /dev/null
+
+html, body {
+ width: 100%;
+ height: 100%;
+ padding: 0;
+ margin: 0;
+}
+
+.wrapper {
+ display: table;
+ width: 100%;
+ height: 100%;
+}
+
+.content {
+ display: table-cell;
+ width: 100%;
+ height: 100%;
+ text-align: center;
+ vertical-align: middle;
+}
+
+pre {
+ margin: auto;
+ text-align: left;
+ width: 400px;
+}
\ No newline at end of file