issue194 -iverson- Search overlap with the filter section

Author: iversonLv

src/shared/components/TopcoderHeader/style.scss

@@ -95,6 +95,7 @@
 }
 
 .search-field {
+  z-index: 1;
   background: $tc-black;
   height: 0;
   margin-top: -1px;

src/shared/components/challenge-detail/Header/style.scss

@@ -343,9 +343,6 @@
           border-right: 1px solid $tc-gray-10;
           font-family: roboto;
           font-weight: 400;
-          &:last-child {
-            border-right: none;
-          }
           .deadline-info {
             font-size: 13px;
             color: $tc-gray-40;