diff --git a/res/css/views/messages/_CallEvent.scss b/res/css/views/messages/_CallEvent.scss
new file mode 100644
index 0000000000..cc465555e8
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+++ b/res/css/views/messages/_CallEvent.scss
@@ -0,0 +1,33 @@
+/*
+Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_CallEvent {
+    display: flex;
+    flex-direction: column;
+
+    background-color: $dark-panel-bg-color;
+    padding: 10px;
+    border-radius: 8px;
+    margin: 10px auto;
+    max-width: 75%;
+    box-sizing: border-box;
+
+    .mx_CallEvent_sender {}
+
+    .mx_CallEvent_type {
+
+    }
+}