chromium/third_party/blink/web_tests/fast/scrolling/resources/scrollable-style.css

.inner {
    position: relative;
    left: 5px;
    color: #ffffff;
    padding: 4px;
    width: 80px;
    height: 30px;
}
.offscreen {
    position: relative;
    top: 100px;
}