src/app/shared/components/loadingPlaceholder/loadingPlaceholder.component.scss

 /********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/
 .timeline-item {
  background: #fff;
  border-radius: 3px;
  padding: 12px;
  margin: 0 auto;
  min-height: 200px;
}

@keyframes placeHolderShimmer{
  0%{
    background-position: -468px 0
  }
  100%{
    background-position: 468px 0
  }
}

.animated-background {
  animation-duration: 1s;
  animation-fill-mode: forwards;
  animation-iteration-count: infinite;
  animation-name: placeHolderShimmer;
  animation-timing-function: linear;
  background: #f6f7f8;
  background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%);
  background-size: 800px 104px;
  height: 180px;
  position: relative;
}

.background-masker {
  background: #fff;
  position: absolute;
}

/* Every thing below this is just positioning */

.background-masker.header-top,
.background-masker.header-bottom,
.background-masker.subheader-bottom {
  top: 0;
  left: 120px;
  right: 0;
  height: 10px;
}

.background-masker.header-left,
.background-masker.subheader-left,
.background-masker.header-right,
.background-masker.subheader-right {
  top: 10px;
  left: 120px;
  height: 12px;
  width: 10px;
}

.background-masker.header-bottom {
  top: 22px;
  height: 12px;
}

.background-masker.subheader-left,
.background-masker.subheader-right {
  top: 34px;
  height: 6px;
}


.background-masker.header-right,
.background-masker.subheader-right {
  width: auto;
  left: 50%;
  right: 0;
}

.background-masker.subheader-right {
  left: 30%;
}

.background-masker.subheader-bottom {
  top: 40px;
  height: 60px;
}

.background-masker.content-top,
.background-masker.content-second-line,
.background-masker.content-third-line,
.background-masker.content-second-end,
.background-masker.content-third-end,
.background-masker.content-first-end {
  top: 100px;
  left: 0;
  right: 0;
  height: 6px;
}

.background-masker.content-top {
  height:34px;
}

.background-masker.content-first-end,
.background-masker.content-second-end,
.background-masker.content-third-end{
  width: auto;
  left: 70%;
  right: 0;
  top: 134px;
  height: 12px;
}

.background-masker.content-second-line  {
  top: 146px;
}

.background-masker.content-second-end {
  left: 80%;
  top: 152px;
}

.background-masker.content-third-line {
  top: 162px;
}

.background-masker.content-third-end {
  left: 60%;
  top: 168px;
}