Various css and markup fixes for changed css classes

src/css/less/gfbox.less

@@ -9,6 +9,10 @@
   margin: 30px 0 0 0;
 }
 
+.gf-box-no-margin {
+  margin: 0;
+}
+
 .gf-box-header-close-btn {
   float: right;
   padding: 0;

src/css/less/overrides.less

@@ -582,9 +582,14 @@ div.flot-text {
   }
 }
 
+.modal-body {
+  padding: 0;
+}
+
 // pre
 code, pre {
   background-color: @grafanaPanelBackground;
   color: @textColor;
 }
 
+

src/css/less/panel.less

@@ -88,7 +88,7 @@
   position: fixed;
   left: 0px;
   right: 0px;
-  top: 55px;
+  top: 60px;
   height: 100%;
   padding: 0;
   background: @grafanaPanelBackground;