third_party/devtools/front_end/source_frame/resourceSourceFrame.css

/*
 * Copyright 2017 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.
 */
.searchable-view {
  flex: 1;
}

.toolbar {
  background-color: #eee;
  border-top: 1px solid #ccc;
}