html {
  overflow-y: scroll;
}
* {
  box-sizing: border-box;
}
body {
  background-color: #fff;
  color: #000;
  font-family: sans-serif;
  padding: 1ex;
  /* center page */
  margin: 0 auto;
  max-width: 80ex;
}
/* HTML5 semantic tags: some (older) browsers display this inline by default */
article, figcaption, figure, header, main, nav {
  display: block;
}
table, img {
  border: 0;
}
img { max-width: 80ex; }
hr {
  border: 0;
  border-bottom: 3px solid #aaa;
  height: 3px;
}
h1 {
  font-size: 140%;
}
h2 {
  font-size: 120%;
}
h3 {
  font-size: 120%;
}
h1,
h1 a,
h1 a:visited,
h2,
h2 a,
h2 a:visited,
h3,
h3 a,
h3 a:visited,
h1 a:hover,
h2 a:hover,
h3 a:hover {
  color: inherit;
  text-decoration: none;
}
table tr td {
  padding: 2px 10px 2px 0px;
}
pre {
  margin: 0;
}
code {
  background-color: #eee;
  border: 3px solid #aaa;
  display: block;
  font-family: monospace;
  overflow-x: auto;
  padding: 5px;
  word-wrap: normal;
}
#menu td {
  padding: 1ex 0;
}
#main {
  border-top: 3px solid #aaa;
  padding: 2ex 0;
}
#menu a {
  font-weight: bold;
  vertical-align: middle;
}
.hidden {
  display: none;
}
footer {
  padding: 10px;
  text-align: center;
  background-color:#507b34;
  color: #fff;
}

.icon img {
  width: 30px;
  height: 30px;
  margin: 0 5px;
}
a.icon {
  text-decoration: none;
  color: none;
}