Merge pull request #6681 from SylvainCorlay/widget_hbox_align

Minor change in widgets.less to fix alignment issue

IPython/html/static/style/ipython.min.css

@@ -1527,7 +1527,10 b' div.cell.text_cell.rendered {'
   box-flex: 0;
   /* Modern browsers */
   flex: none;
-  margin: 5px;
+  margin-top: 0px !important;
+  margin-bottom: 0px !important;
+  margin-right: 5px;
+  margin-left: 5px;
 }
 .widget-hbox input[type="checkbox"] {
   margin-top: 9px;

IPython/html/static/style/style.min.css

@@ -9402,7 +9402,10 b' div.cell.text_cell.rendered {'
   box-flex: 0;
   /* Modern browsers */
   flex: none;
-  margin: 5px;
+  margin-top: 0px !important;
+  margin-bottom: 0px !important;
+  margin-right: 5px;
+  margin-left: 5px;
 }
 .widget-hbox input[type="checkbox"] {
   margin-top: 9px;

IPython/html/static/widgets/less/widgets.less

@@ -188,7 +188,10 b''
 .widget-hbox {
     /* Horizontal widgets */
     .hbox();
-    margin: 5px;
+    margin-top: 0px !important;
+    margin-bottom: 0px !important;
+    margin-right: 5px;
+    margin-left: 5px;
 
     input[type="checkbox"] {
         margin-top: 9px;