diff --git a/packages/css/themes/src/common/colors.css b/packages/css/themes/src/common/colors.css
index 6737035e..c7b26c60 100644
--- a/packages/css/themes/src/common/colors.css
+++ b/packages/css/themes/src/common/colors.css
@@ -35,6 +35,8 @@
     --nlux-aiMsg--bgClr: var(--nlux-AiMessage--BackgroundColor);
     --nlux-aiMsg--brdClr: var(--nlux-AiMessage--BorderColor);
     --nlux-aiMsg--txtClr: var(--nlux-AiMessage--TextColor);
+    /** Prompt container */
+    --nlux-cmp-cnt--bgClr: var(--nlux-composer-container--BackgroundColor, transparent);
 
     /** Prompt input colors */
     --nlux-prmInp--bgClr: var(--nlux-PromptInput--BackgroundColor);
diff --git a/packages/css/themes/src/common/structure.css b/packages/css/themes/src/common/structure.css
index fab73039..069ffca1 100644
--- a/packages/css/themes/src/common/structure.css
+++ b/packages/css/themes/src/common/structure.css
@@ -44,6 +44,8 @@
             flex-direction: row;
             align-items: stretch;
 
+            background-color: var(--nlux-cmp-cnt--bgClr);
+            
             > .nlux-comp-composer {
                 width: 100%;
             }
diff --git a/packages/css/themes/src/dev/colors.css b/packages/css/themes/src/dev/colors.css
index f69089b6..c2c4578d 100644
--- a/packages/css/themes/src/dev/colors.css
+++ b/packages/css/themes/src/dev/colors.css
@@ -41,6 +41,9 @@
     /** 👇 Divider between composer and messages */
     --nlux-ChatRoom-Divider--Color: red;
 
+    /** 👇 Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** 👇 Prompt input colors */
     --nlux-PromptInput--BackgroundColor: honeydew;
     --nlux-PromptInput--BorderColor: mediumseagreen;
diff --git a/packages/css/themes/src/luna/colors-dark.css b/packages/css/themes/src/luna/colors-dark.css
index 750151a4..f215395c 100644
--- a/packages/css/themes/src/luna/colors-dark.css
+++ b/packages/css/themes/src/luna/colors-dark.css
@@ -25,6 +25,9 @@
     --nlux-ChatRoom--BorderColor: transparent;
     --nlux-ChatRoom--TextColor: #ffffff;
 
+    /** Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** Participant info in chat */
     --nlux-ChatItem-ParticipantName--Color: #E0E0E0;
 
diff --git a/packages/css/themes/src/luna/colors-light.css b/packages/css/themes/src/luna/colors-light.css
index 8df0cc5c..1a679bd3 100644
--- a/packages/css/themes/src/luna/colors-light.css
+++ b/packages/css/themes/src/luna/colors-light.css
@@ -38,6 +38,9 @@
     --nlux-AiMessage--BorderColor: #dde5e2;
     --nlux-AiMessage--TextColor: #18210c;
 
+    /** Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** Prompt input colors */
     --nlux-PromptInput--BackgroundColor: #ffffff;
     --nlux-PromptInput--BorderColor: #c5d7c9;
diff --git a/packages/css/themes/src/nova/colors-dark.css b/packages/css/themes/src/nova/colors-dark.css
index 74cf742c..a901c656 100644
--- a/packages/css/themes/src/nova/colors-dark.css
+++ b/packages/css/themes/src/nova/colors-dark.css
@@ -32,6 +32,9 @@
     --nlux-AiMessage--BorderColor: transparent;
     --nlux-AiMessage--TextColor: #ffffff;
 
+    /** Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** Prompt input colors */
     --nlux-PromptInput--BackgroundColor: transparent;
     --nlux-PromptInput--BorderColor: transparent;
diff --git a/packages/css/themes/src/nova/colors-light.css b/packages/css/themes/src/nova/colors-light.css
index fdd25933..33d6708c 100644
--- a/packages/css/themes/src/nova/colors-light.css
+++ b/packages/css/themes/src/nova/colors-light.css
@@ -32,6 +32,9 @@
     --nlux-AiMessage--BorderColor: transparent;
     --nlux-AiMessage--TextColor: #09090B;
 
+    /** Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** Prompt input colors */
     --nlux-PromptInput--BackgroundColor: transparent;
     --nlux-PromptInput--BorderColor: transparent;
diff --git a/packages/css/themes/src/openai/colors-dark.css b/packages/css/themes/src/openai/colors-dark.css
index 89f4e2e9..1350533e 100644
--- a/packages/css/themes/src/openai/colors-dark.css
+++ b/packages/css/themes/src/openai/colors-dark.css
@@ -32,6 +32,9 @@
     --nlux-AiMessage--BorderColor: transparent;
     --nlux-AiMessage--TextColor: #ffffff;
 
+    /** Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** Prompt input colors */
     --nlux-PromptInput--BackgroundColor: transparent;
     --nlux-PromptInput--BorderColor: transparent;
diff --git a/packages/css/themes/src/openai/colors-light.css b/packages/css/themes/src/openai/colors-light.css
index 4f1586a5..7d7bea8d 100644
--- a/packages/css/themes/src/openai/colors-light.css
+++ b/packages/css/themes/src/openai/colors-light.css
@@ -32,6 +32,9 @@
     --nlux-AiMessage--BorderColor: transparent;
     --nlux-AiMessage--TextColor: #09090B;
 
+    /** Prompt container */
+    --nlux-composer-container--BackgroundColor: transparent;
+    
     /** Prompt input colors */
     --nlux-PromptInput--BackgroundColor: transparent;
     --nlux-PromptInput--BorderColor: transparent;