/* */

* {
  box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
}

html {
  font-family: 'IBM Plex Serif', serif;
  font-size: 18px;
}

body {
  border: 0px;
  margin: 0px;
  padding: 0px;
  color: black;
  background-color: #fcfffc;
}

.main {
  margin: 4em 0px 8em 0px;
  padding: 0.4em 0.2em;

  column-count: 4;
  column-width: 22em;

  -webkit-column-gap: 0px;
  -moz-column-gap: 0px;
  column-gap: 0px;

  column-rule: 1px solid lightgrey;
}

.main > div {
  -webkit-column-break-inside: avoid;
  -moz-column-break-inside: avoid;
  -o-column-break-inside: avoid;
  -ms-column-break-inside: avoid;
  column-break-inside: avoid;
  page-break-inside: avoid;

  /* zo moet het */
  break-inside: avoid;

  padding: 0px 1em;
  margin: 0px 0.2em 4em 0.2em;
}

.footer {
  text-align: center;
  font-size: small;
  margin-bottom: 2em;
}

h1 {
  margin-top: 4em;
  text-align: center;
}

h1,
h2 {
  color: #62757f;
  letter-spacing: 0.1em;
  margin-top: 2em;
}
h1 {
  font-size: xx-large;
  font-weight: 200;
}
h2 {
  margin-top: 0px;
  font-size: x-large;
  font-weight: 300;
}

ul {
  list-style-type: square;
}
ul > li > ul {
  list-style-type: circle;
}
ul > li > ul > li > ul {
  list-style-type: disc;
}

ul {
  margin-top: 0.4em;
  margin-bottom: 0.8em;
}

li {
  margin-bottom: 0.5em;
}

a {
  text-decoration: none;
  color: #0000ee;
}

a:hover {
  text-decoration: underline;
}

span.old {
  text-decoration: line-through;
  color: #90a4ae;
  font-size: smaller;
}