ui/css/src/scss/components/loading-overlay.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.

.loading-overlay {
  opacity: 0.7;
  position: absolute;
  z-index: $z-index-loading-overlay;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  /*+opacity:70%;*/
  background: #f2f2f2 url('../images/ajax-loader.gif') no-repeat center;
  filter: alpha(opacity=70);
  -ms-filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=70);
  -moz-opacity: 0.7;
}

.loading-overlay span {
  display: block;
  margin: 155px 0 0 5px;
  color: #4b4b4b;
  text-align: center;
}

.detail-view .ui-tabs-panel .loading-overlay {
  background-position: 50% 250px;
}