Create style.css

src/addons/addons/fps/style.css

@@ -0,0 +1,19 @@
+.fps-counter {
+  font-size: 0.625rem;
+  font-weight: bold;
+  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+  white-space: nowrap;
+  padding: 0.25rem;
+  user-select: none;
+  color: #0fbd8c;
+  display: none;
+  align-items: center;
+}
+
+.fps-counter.show {
+  display: flex;
+}
+
+.sa-small-stage .fps-counter {
+  display: none;
+}