third_party/devtools/front_end/animation/animationScreenshotPopover.css

/*
 * Copyright (c) 2015 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

img {
    max-height: 300px;
    border-radius: 2px;
}

.animation-progress {
    position: absolute;
    height: 2px;
    bottom: 0;
    left: 0;
    background: var(--selection-bg-color);
}