index.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.
 */
* {
  -webkit-tap-highlight-color: rgba(
    0,
    0,
    0,
    0
  ); /* make transparent link selection, adjust last value opacity 0 to 1.0 */
}
* {
  margin: 0;
  padding: 0;
}

html,
body {
  overflow: hidden;
}

body {
  -webkit-touch-callout: none; /* prevent callout to copy image, etc when tap to hold */
  -webkit-text-size-adjust: none; /* prevent webkit from resizing text to fit */
  -webkit-user-select: none; /* prevent copy paste, to allow, change 'none' to 'text' */
  background-color: #000000;
  /*
  background-image:linear-gradient(top, #000000 0%, #404040 51%);
  background-image:-webkit-linear-gradient(top, #000000 0%, #404040 51%);
  background-image:-ms-linear-gradient(top, #000000 0%, #404040 51%);
  background-image:-webkit-gradient(
      linear,
      left top,
      left bottom,
      color-stop(0, #000000),
      color-stop(0.51, #404040)
  );
  */
  background-attachment: fixed;
  font-family: "HelveticaNeue-Light", "HelveticaNeue", Helvetica, Arial,
    sans-serif;
  font-size: 12px;
  height: 100%;
  margin: 0px;
  padding: 0px;
  text-transform: uppercase;
  width: 100%;
}

/* Portrait layout (default) */
.app {
  /* background:url(../img/logo.png) no-repeat center top; */ /* 170px x 200px */
  position: absolute; /* position in the center of the screen */
  left: 50%;
  top: 50%;
  height: 50px; /* text area height */
  width: 225px; /* text area width */
  text-align: center;
  padding: 180px 0px 0px 0px; /* image height is 200px (bottom 20px are overlapped with text) */
  margin: -115px 0px 0px -112px; /* offset vertical: half of image height and text area height */
  /* offset horizontal: half of text area width */
}

/* Landscape layout (with min-width) */
@media screen and (min-aspect-ratio: 1/1) and (min-width: 400px) {
  .app {
    background-position: left center;
    padding: 75px 0px 75px 170px; /* padding-top + padding-bottom + text area = image height */
    margin: -90px 0px 0px -198px; /* offset vertical: half of image height */
    /* offset horizontal: half of image width and text area width */
  }
}

h1 {
  font-size: 24px;
  font-weight: normal;
  margin: 0px;
  overflow: visible;
  padding: 0px;
  text-align: center;
}

.event {
  border-radius: 4px;
  -webkit-border-radius: 4px;
  color: #ffffff;
  font-size: 12px;
  margin: 0px 30px;
  padding: 2px 0px;
}

.event.listening {
  background-color: #333333;
  display: block;
}

.event.received {
  background-color: #4b946a;
  display: none;
}

@keyframes fade {
  from {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
  to {
    opacity: 1;
  }
}

@-webkit-keyframes fade {
  from {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
  to {
    opacity: 1;
  }
}

.blink {
  animation: fade 3000ms infinite;
  -webkit-animation: fade 3000ms infinite;
}