style.css

/**
 * @license
 * Copyright 2018 Google LLC. All Rights Reserved.
 * Licensed 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.
 * =============================================================================
 */

/******************************************************
 * Stylesheet by Jason Mayes 2020.
 *
 * Got questions? Reach out to me on social:
 * Twitter: @jason_mayes
 * LinkedIn: https://www.linkedin.com/in/creativetech
 *****************************************************/

body {
  font-family: helvetica, arial, sans-serif;
  margin: 2em;
  color: #3d3d3d;
}

h1 {
  font-style: italic;
  color: #ff6f00;
}

h2 {
  clear: both;
}

em {
  font-weight: bold;
}

video {
  -webkit-transform: scaleX(-1);
  transform: scaleX(-1);
  clear: both;
  display: block;
}

section {
  opacity: 1;
  transition: opacity 500ms ease-in-out;
}

header,
footer {
  clear: both;
}

.removed {
  display: none;
}

.invisible {
  opacity: 0.2;
}

.note {
  font-style: italic;
  font-size: 130%;
}

.videoView,
.classifyOnClick {
  position: relative;
  float: left;
  width: 48%;
  margin: 2% 1%;
  cursor: pointer;
}

.videoView p,
.classifyOnClick p {
  position: absolute;
  padding: 5px;
  background-color: rgba(255, 111, 0, 0.85);
  color: #fff;
  border: 1px dashed rgba(255, 255, 255, 0.7);
  z-index: 2;
  font-size: 12px;
  margin: 0;
}

.highlighter {
  background: rgba(0, 255, 0, 0.25);
  border: 1px dashed #fff;
  z-index: 1;
  position: absolute;
}

.classifyOnClick {
  z-index: 0;
}

.classifyOnClick img {
  width: 100%;
}