Set box-shadow opacity to 20%

Signed-off-by: Šimon Brandner <[email protected]>

Author: SimonBrandner

res/css/views/voip/_CallView.scss

@@ -41,7 +41,7 @@ limitations under the License.
     padding-bottom: 8px;
     margin-top: 10px;
     background-color: $voipcall-plinth-color;
-    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.5);
+    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.20);
     border-radius: 8px;
 
     .mx_CallView_voice {