header {
  position: sticky;
  top: 0;
  z-index: 999;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

h1 {
  font-family: 'Brush Script MT', cursive;
  font-size: 3.5em;
}
 h2 {
  font-family: Garamond, serif;
  font-size: 2em;
 }
 h3 {
  font-family: Garamond, serif;
  font-size: 1.5em;
 }
 h4 {
  font-family: Arial, serif;
  font-size: 1.2em;
 }

 .center {
  text-align: center;
 }

.paragraph {
  text-indent: 2em;
}

.img_centre {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.img_right {
  float: right;
  margin-bottom: 3em;
}

 html,body{font-family:Arial,sans-serif;font-size:1em;line-height:1.5;margin-right:3em;margin-left:3em;}html{overflow-x:hidden}

/* click-zoom from https://stackoverflow.com/a/56401601/5009913 */
 .click-zoom input[type=checkbox] {
  display: none
}

.click-zoom img {
  transition: transform 0.25s ease;
  cursor: zoom-in
}

.click-zoom input[type=checkbox]:checked~img {
  transform: scale(2);
  cursor: zoom-out
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
  html, body {
    margin-right: 1em;
    margin-left: 1em;
    font-size: 0.95em;
  }

  h1 {
    font-size: 2.5em;
  }

  h2 {
    font-size: 1.6em;
  }

  h3 {
    font-size: 1.3em;
  }

  h4 {
    font-size: 1.1em;
  }

  .img_right {
    float: none;
    display: block;
    margin: 1em auto;
    max-width: 100%;
  }

  .img_centre {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  html, body {
    margin-right: 0.5em;
    margin-left: 0.5em;
  }

  h1 {
    font-size: 2em;
  }

  h2 {
    font-size: 1.4em;
  }
}