Fixes mix-blend-mode for Safari in base.scss

Change-Id: Ic6eb8b58531057678a9915b229f5fd145dfa3218
diff --git a/dev/scss/base/base.scss b/dev/scss/base/base.scss
index 4f4c77e..5d8577e 100644
--- a/dev/scss/base/base.scss
+++ b/dev/scss/base/base.scss
@@ -99,8 +99,9 @@
   border-left:      5px solid $ids-blue-1;
   background-color: $ids-blue-2;
   color:            $ids-blue-1;
+  -webkit-mix-blend-mode: normal; // Safari
   mix-blend-mode:   soft-light;
-
+  
   &.bug,
   &.missing,
   &.warning {