Update app.postcss

Author: cjyetman

src/app.postcss

@@ -13,6 +13,7 @@ body {
 }
 .tab-list {
 	position: fixed;
+	z-index: 1;
 	top: 75px;
 	width: 100%;
 	background-color: rgb(var(--color-surface-100));