diff --git a/popout.html b/popout.html
index cd5225b..486accf 100644
--- a/popout.html
+++ b/popout.html
@@ -67,6 +67,9 @@ body{
 }
 
 button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
     -webkit-app-region: no-drag;
     user-select: none;
     cursor: pointer;