modules/frontend/app/components/web-console-sidebar/web-console-sidebar-overflow/style.scss

/*
 * 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.
 */

web-console-sidebar-overflow {
    overflow: hidden;
    position: relative;
    display: flex;

    &>.web-console-sidebar-overflow__scroll-root {
        overflow-x: hidden;
        overflow-y: scroll;
        margin-right: calc(-1 * var(--scrollbar-width));

        &.top:before {
            display: block;
            width: 100%;
            content: '';
            height: 1px;
            position: absolute;
            top: -1px;
            box-shadow: 0 0 9px 1px #a0a0a0;
            transform: translateZ(1px);
        }
        &.bottom:after {
            display: block;
            width: 100%;
            content: '';
            position: absolute;
            bottom: 0;
            box-shadow: 0 0 9px 1px #a0a0a0;
            transform: translateZ(1px);
        }

        &>ng-transclude {
            display: block;
        }
    }
}