Updated CSS.

src/snek/static/base.css

@@ -2,6 +2,9 @@
   margin: 0;
   /*padding: 0;*/
   box-sizing: border-box;
+ white-space: pre-wrap; 
+  word-break: break-word; 
+  overflow-wrap: break-word;
 }
 
 .gallery {

src/snek/static/highlight.css

@@ -1,4 +1,6 @@
-pre { line-height: 125%; }
+pre { line-height: 125%;  white-space: pre-wrap; 
+  word-break: break-word; 
+  overflow-wrap: break-word; }
 td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
 span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
 td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }