hf: classic theme border sizing

fixes an issue with the classic theme where the borders of page contents
are slightly too large

asklyphe-frontend/static/themes/classic/search.css

@@ -2,6 +2,7 @@
     background: url("/static/snow.gif");
     border: 3px inset black;
     color: black;
+    box-sizing: border-box;
 }
 
 @media screen and (max-width: 800px) {

asklyphe-frontend/static/themes/classic/settings.css

@@ -1,6 +1,7 @@
 .settings-area {
     background: url("/static/snow.gif");
     border: 1px solid white;
+    box-sizing: border-box;
 }
 
 @media screen and (max-width: 800px) {