FIX: updates blend to use var

FIX: updates blend to use var

diff --git a/common/common.scss b/common/common.scss
index 2810aca..fe3f138 100644
--- a/common/common.scss
+++ b/common/common.scss
@@ -8,7 +8,7 @@ div.d-wrap[data-wrap="placeholder"] {
   align-items: center;
   justify-content: space-between;
   border-left: 5px solid var(--primary-low);
-  background-color: blend-primary-secondary(5%);
+  background-color: var(--blend-primary-secondary-5);
 
   .discourse-placeholder-name {
     width: 200px;

GitHub sha: 3d0d4f2ca2d4b3732949e238c87e2efdb91b8243