guacamole/src/main/frontend/src/app/settings/styles/buttons.css

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

a.button.add-user,
a.button.add-user-group,
a.button.add-connection,
a.button.add-connection-group,
a.button.import-connections {
    font-size: 0.8em;
    padding-left: 1.8em;
    position: relative;
}

a.button.add-user::before,
a.button.add-user-group::before,
a.button.add-connection::before,
a.button.add-connection-group::before,
a.button.import-connections::before {

    content: ' ';
    position: absolute;
    width: 1.8em;
    top: 0;
    bottom: 0;
    left: 0;

    background-repeat: no-repeat;
    background-size: 1em;
    background-position: 0.5em 0.45em;

}

a.button.add-user::before {
    background-image: url('images/action-icons/guac-user-add.svg');
}

a.button.add-user-group::before {
    background-image: url('images/action-icons/guac-user-group-add.svg');
}

a.button.add-connection::before {
    background-image: url('images/action-icons/guac-monitor-add.svg');
}

a.button.add-connection-group::before {
    background-image: url('images/action-icons/guac-group-add.svg');
}

a.button.import-connections::before {
    background-image: url('images/action-icons/guac-file-import.svg');
}