h3 ,h2{
  text-align: center;
}

h4 {
  /* margin: 10px 0; */
  margin: 0;
  padding-top: 10px;
}

* {
  margin: 0;
  padding: 0;
}

pre {
  padding: 20px;
  white-space: pre-wrap;
  line-height: 1.6;
  word-wrap: break-word;
}

body {
  padding: 5px;
  font-size: 16px;
}