Fix table header

Makes the table header in sensor page stay fixed after scrolling.
Fixes the allignment of filter button.

Resolves openbmc/phosphor-webui#28

Change-Id: If9b8b0848169b5924b811e67588ff57c8dae7c5c
Signed-off-by: Iftekharul Islam <iffy.ryan@ibm.com>
diff --git a/app/common/styles/components/table.scss b/app/common/styles/components/table.scss
index 01c0632..c26ba59 100644
--- a/app/common/styles/components/table.scss
+++ b/app/common/styles/components/table.scss
@@ -109,6 +109,13 @@
   @include indeterminate-bar;
 }
 
+// sensor fixed table header on scroll
+.fixed-table-header{
+  position: sticky;
+  top: 130px;
+  z-index: 1;
+}
+
 //sortable heading
 .sort-heading {
   position: relative;