Added bottom margin to text widget

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

@@ -101,6 +101,7 b''
     height     : 5px;
     max-height : 5px;
     margin-top : 11px;
+    margin-bottom: 10px;
     
     /* Style the slider track */
     .slide-track();
@@ -165,7 +166,7 b''
 .widget-text {
     /* String Textbox - used for TextBoxView and TextAreaView */
     width         : 350px;
-    margin-bottom : 0px;
+    margin : 0px !important;
 }
 
 .widget-listbox {