Fix large images on the frontpage and tweak fieldset spacing

static/css/main.css

@@ -298,6 +298,7 @@ tr.sticky a:link {
 fieldset {
     background-color:#111;
     border: 1px solid black;
+    padding: 1em;
 }
 
 .avatar img {
@@ -316,6 +317,10 @@ fieldset {
   float: left;
 }
 
+.news-item {
+  overflow: hidden;
+}
+
 .forum {
     vertical-align: middle;
 }