diff --git a/extensions/theme-defaults/themes/2026-dark.json b/extensions/theme-defaults/themes/2026-dark.json
index 9427640c404..0b70584fe0a 100644
--- a/extensions/theme-defaults/themes/2026-dark.json
+++ b/extensions/theme-defaults/themes/2026-dark.json
@@ -272,6 +272,38 @@
 		"minimapSlider.background": "#83848533",
 		"minimapSlider.hoverBackground": "#83848566",
 		"minimapSlider.activeBackground": "#83848599",
+
+		"sessionsSidebar.background": "#121314",
+		"sessionsSidebar.foreground": "#bfbfbf",
+		"sessionsSidebar.border": "#2A2B2CFF",
+		"sessionsSidebarHeader.background": "#121314",
+		"sessionsSidebarHeader.foreground": "#bfbfbf",
+		"sessionsAuxiliaryBar.background": "#191A1B",
+		"sessionsAuxiliaryBar.foreground": "#bfbfbf",
+		"sessionsAuxiliaryBar.border": "#2A2B2CFF",
+		"sessionsPanel.background": "#191A1B",
+		"sessionsPanel.foreground": "#bfbfbf",
+		"sessionsPanel.border": "#2A2B2CFF",
+		"chatBar.background": "#191A1B",
+		"chatBar.foreground": "#bfbfbf",
+		"chatBar.border": "#2A2B2CFF",
+		"chatBarTitle.background": "#121314",
+		"chatBarTitle.foreground": "#bfbfbf",
+		"chatBarTab.activeForeground": "#bfbfbf",
+		"chatBarTab.inactiveForeground": "#8C8C8C",
+		"chatBarTab.activeBorder": "#3994BC",
+		"sessionsCard.border": "#2A2B2CFF",
+		"sessionsGradient.tintColor": "#297AA0",
+		"chatInput.background": "#202122",
+		"chatInput.foreground": "#bfbfbf",
+		"chatInput.border": "#333536",
+		"chatInput.focusBorder": "#3994BCB3",
+		"chatInput.placeholderForeground": "#555555",
+		"sessionsBadge.background": "#3994BC",
+		"sessionsBadge.foreground": "#FFFFFF",
+		"sessionsUnreadBadge.background": "#3994BC",
+		"sessionsUnreadBadge.foreground": "#FFFFFF",
+		"sessionsInput.border": "#333536FF"
 	},
 	"tokenColors": [
 		{
diff --git a/src/vs/sessions/browser/media/style.css b/src/vs/sessions/browser/media/style.css
index 63fa40b0bd6..0813d54f32d 100644
--- a/src/vs/sessions/browser/media/style.css
+++ b/src/vs/sessions/browser/media/style.css
@@ -209,11 +209,18 @@
 .agent-sessions-workbench .interactive-session .chat-input-container {
 	border-radius: var(--vscode-cornerRadius-large);
 	border-color: var(--vscode-chatInput-border, var(--vscode-editorWidget-border, var(--vscode-widget-border))) !important;
+	background-color: var(--vscode-chatInput-background, var(--vscode-input-background));
 }
 
 .agent-sessions-workbench .interactive-session .chat-input-container.focused {
 	border-color: var(--vscode-chatInput-focusBorder, var(--vscode-focusBorder)) !important;
 }
+
+/* Make the Monaco editor inside the chat input transparent so it inherits the chatInput.background */
+.agent-sessions-workbench .interactive-session .interactive-input-part .chat-editor-container .interactive-input-editor .monaco-editor,
+.agent-sessions-workbench .interactive-session .interactive-input-part .chat-editor-container .interactive-input-editor .monaco-editor .monaco-editor-background {
+	background-color: transparent !important;
+}
 .agent-sessions-workbench .interactive-session .interactive-input-part {
 	width: 100%;
 	max-width: 950px;
diff --git a/src/vs/sessions/contrib/chat/browser/media/chatInput.css b/src/vs/sessions/contrib/chat/browser/media/chatInput.css
index 12e00dce02f..6ee49fb5a3b 100644
--- a/src/vs/sessions/contrib/chat/browser/media/chatInput.css
+++ b/src/vs/sessions/contrib/chat/browser/media/chatInput.css
@@ -64,7 +64,7 @@
 .sessions-chat-editor .monaco-editor,
 .sessions-chat-editor .monaco-editor .overflow-guard,
 .sessions-chat-editor .monaco-editor-background {
-	background-color: var(--vscode-input-background) !important;
+	background-color: transparent !important;
 	border-radius: 8px 8px 0 0;
 }