chromium/third_party/blink/web_tests/animations/responsive/resources/zoom-responsive.css

#container {
  position: absolute;
  top: 0;
  font-size: 10px;
}
.target {
  width: 40px;
  height: 40px;
  border-top: solid;
  border-left: solid;
  margin-bottom: 20px;
}