syncthing/gui/default/assets/css/theme.css

/*
// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.

*/

.panel-progress {
    background: #3498db;
}

.identicon rect {
    fill: #333;
}

.li-column {
    background-color: rgb(236, 240, 241);
    border-radius: 3px;
}