feat(YfmTabs): change text color of yfm-tabs tab placeholder (#192)

Author: d3m1d0v

src/extensions/yfm/YfmTabs/index.scss

@@ -16,6 +16,10 @@
 
         border-bottom: none;
 
+        .ye-placeholder {
+            color: var(--g-color-text-hint);
+        }
+
         &-wrapper {
             position: relative;