body {
  margin: 0px;
  padding: 0px;
  background-color: Ivory;
  font-family: Arial, Verdana, sans-serif;
  font-size: 100%;
  font-weight: normal;
  }

 .logo {
   height: 60px;
   vertical-align: middle;
   }
 .neo {
   font-size: xxx-large;
   font-weight: bold;
   color: DarkOliveGreen;
   letter-spacing: 0px;
   text-shadow: 0px 0px 10px;
   vertical-align: middle;
   }
 .neon {
   font-size: large;
   font-weight: bold;
   color: DarkOliveGreen;
   text-shadow: 0px 0px 5px;
   vertical-align: middle;
   }
 .page {
   margin: 4px;
   padding: 3px;
   background-color: LemonChiffon;
   line-height: 1.3;
   }
 .img_book {
   width: 88px;
   margin-right: 10px;
   float: left;
   box-shadow: 6px 6px 12px rgba(0, 0, 0, 0.6);
   }

 h1, h2, h3, h4, h5, h6 {
  text-align: center;
  color: DarkOliveGreen;
 }
 p {
  text-align: justify;
 }
 b {
  color: Green;
 }
 strong {
  color: DarkRed;
 }

 .comm {
  margin-top: 0px;
  margin-right: 5px;
  margin-bottom: 0px;
  margin-left: 5px;

  padding-top: 5px;
  padding-right: 5px;
  padding-bottom: 5px;
  padding-left: 5px;

  border: 0px solid darkOliveGreen;
  background-color: PaleGoldenRod;

  font-weight: bolder;
  color: DarkOliveGreen;

  display: block;
 }
 .example {
  margin-top: 0px;
  margin-right: 5px;
  margin-bottom: 0px;
  margin-left: 5px;

  padding-top: 5px;
  padding-right: 5px;
  padding-bottom: 5px;
  padding-left: 5px;

  border: 0px solid darkOliveGreen;
  background-color: LightYellow;

  font-family: consolas, "SF Mono", cousine, roboto;
  font-weight: bolder;
  color: DarkOliveGreen;

  display: block;
  overflow: auto;
 }
 .example_header {
  border: 0px solid darkOliveGreen;
  font-family: consolas, "SF Mono", cousine, roboto;
  font-weight: bolder;
  color: DarkOliveGreen;
 }

 .plus {
  width: 25px;
  height: 25px;
  margin: 0px;
  padding: 0px;
  border: 2px solid green;
  border-radius: 15px;
  background-color: ivory;
  font-size: 16px;
  font-weight: bold;
  color: DarkOliveGreen;
  vertical-align: top;
  transition-duration: 0.5s;
 }
 .plus:hover {
  cursor: pointer;
  background-color: LightGreen;
 }
 .minus {
  width: 25px;
  height: 25px;
  margin: 0px;
  padding: 0px;
  border: 2px solid green;
  border-radius: 15px;
  background-color: ivory;
  font-size: 10px;
  font-weight: bold;
  color: DarkOliveGreen;
  vertical-align: top;
  transition-duration: 0.5s;
 }
 .minus:hover {
  cursor: pointer;
  background-color: LightGreen;
 }