Improve entry icon style

Top margin pushed entry icons out of their parent links, resulting
in difficulties when clicking the icon on mobile devices.

This commit removes the margin and adds a padding for even better
clickability.

public/css/style.css

@@ -580,16 +580,19 @@ body * {
             vertical-align: sub;
         }
 
-    .entry-icon,
+    .entry-icon {
+        float: left;
+        text-decoration: none;
+        margin-right: 0;
+    }
+
     .entry-icon img {
-        margin-top:3px;
-        display:block;
-        float:left;
-        width:16px;
-        height:16px;
-        text-decoration:none;
+        display: block;
+        padding: 6px;
+        width: 16px;
+        height: 16px;
     }
-    
+
     .entry-link {
         display:none;
     }