diff --git a/src/vector/jitsi/index.scss b/src/vector/jitsi/index.scss
index a4ae84cacf..2c7e020c96 100644
--- a/src/vector/jitsi/index.scss
+++ b/src/vector/jitsi/index.scss
@@ -24,7 +24,7 @@ limitations under the License.
 }
 
 $dark-fg: #edf3ff;
-$dark-bg: rgba(141, 151, 165, 0.2);
+$dark-bg: #363c43;
 $light-fg: #2e2f32;
 $light-bg: #fff;
 body {
diff --git a/src/vector/jitsi/index.ts b/src/vector/jitsi/index.ts
index 6aeba8f7aa..a5a8be36e2 100644
--- a/src/vector/jitsi/index.ts
+++ b/src/vector/jitsi/index.ts
@@ -70,7 +70,7 @@ let meetApi: any; // JitsiMeetExternalAPI
         const theme = qsParam('theme', true);
 
         if (theme) {
-            document.body.classList.add(`theme-${theme}`);
+            document.body.classList.add(`theme-${theme.replace(" ", "_")}`);
         }
 
         // Set this up as early as possible because Element will be hitting it almost immediately.