Add separate mx_CallView_content class

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

res/css/views/voip/_CallView.scss

@@ -64,14 +64,17 @@ limitations under the License.
     }
 }
 
-.mx_CallView_voice {
+.mx_CallView_content {
     position: relative;
     display: flex;
-    flex-direction: column;
+    border-radius: 8px;
+}
+
+.mx_CallView_voice {
     align-items: center;
     justify-content: center;
+    flex-direction: column;
     background-color: $inverted-bg-color;
-    border-radius: 8px;
 }
 
 .mx_CallView_voice_avatarsContainer {
@@ -108,11 +111,8 @@ limitations under the License.
 .mx_CallView_video {
     width: 100%;
     height: 100%;
-    position: relative;
     z-index: 30;
-    border-radius: 8px;
     overflow: hidden;
-    display: flex;
 }
 
 .mx_CallView_video_hold {