diff --git a/web/themes/manual-dark.css b/web/themes/manual-dark.css
index 4a837a6f66..31078516db 100644
--- a/web/themes/manual-dark.css
+++ b/web/themes/manual-dark.css
@@ -63,7 +63,7 @@ html[data-theme="dark"] {
     --color-premium-badge-border-highlight-color: #ffffff33;
     --color-price-enterprise-background: linear-gradient(180deg, rgba(185, 211, 234, 0.00) 0%, rgba(180, 209, 234, 0.92) 100%);
     --color-grid-mask-background: linear-gradient(0deg, rgba(0, 0, 0, 0.00) 0%, rgba(24, 24, 25, 0.1) 62.25%, rgba(24, 24, 25, 0.10) 100%);
-    --color-node-data-source-bg: linear-gradient(100deg, var(--workflow-block-wrapper-bg-1, #E9EBF0) 0%, var(--workflow-block-wrapper-bg-2, rgba(233, 235, 240, 0.20)) 100%);
+    --color-node-data-source-bg: linear-gradient(100deg, var(--workflow-block-wrapper-bg-1, rgba(39, 39, 43, 1)) 0%, var(--workflow-block-wrapper-bg-2, rgba(39, 39, 43, 0.2)) 100%);
     --color-tag-selector-mask-bg: linear-gradient(90deg, rgba(34, 34, 37, 0) 0%, rgba(34, 34, 37, 1) 100%);
     --color-tag-selector-mask-hover-bg: linear-gradient(90deg, rgba(39, 39, 43, 0) 0%, rgba(39, 39, 43, 1) 100%);
     --color-pipeline-template-card-hover-bg: linear-gradient(0deg, rgba(58, 58, 64, 1) 60.27%, rgba(58, 58, 64, 0) 100%);