diff --git a/tests/manual/vector-features-performance.html b/tests/manual/vector-features-performance.html
index 0c5d6091e7..5122c9b5fa 100644
--- a/tests/manual/vector-features-performance.html
+++ b/tests/manual/vector-features-performance.html
@@ -9,16 +9,16 @@
padding-top: 1em;
}
#map {
- margin: 1em;
width: 512px;
height: 512px;
+ border: 1px solid black;
}