body {
	font-family: "Courier", Monospace;
  padding: 10px;
}

.title{
  font-size: 2em;
  font-weight: bold;
  margin-top: 0px;
  padding-top: 0px;
  border: 0px;
  margin-bottom: 10px;
}

a{
	color: black;
	text-decoration: none;
  font-weight: bold;
}

a:hover {
    text-decoration: underline;
}

.about {
  max-width: 600px;
}

h4 {
  margin-top: 1.0em;
  margin-bottom: 0.1em;
}

.social-icon {
  display: inline-block;
  vertical-align: middle;
  margin-right: 6px;
}

.social-icon-inline {
  display: inline-block;
  vertical-align: middle;
  margin-right: 3px;
}

.example {
  text-align: center;
  max-width: 300px;
  max-height: 600px;
  float: left;
  padding: 5px;
  margin-right:20px;
  margin-left:20px;
}


/*Home page*/
.subtopics {
  opacity: 0;
  visibility: hidden;
}
.topic:hover + .subtopics {
  opacity: 1;
  visibility: visible;
}

.subtopics:hover {
  opacity: 1;
  visibility: visible;
}

.topic {
    width: 220px;
    float: left;
    height: 50px;
    margin-right:20px;
    text-align: right;
}

.topic-box {
    width: 260px;
    height: 50px;
}

.sidebar-link {
  font-weight: normal;
}

.sidebar-link.active {
  font-weight: bold;
}

/* Sidebar layout */
.page-layout {
  display: flex;
  align-items: flex-start;
  margin-top: 5px;
}

.sidebar-column {
  width: 260px; /* matches topic-box width */
  margin-top: 0;
}

#sidebar {
  margin-top: 0;
}

.page-content {
  flex: 1;
  margin-left: 20px;
  margin-top: 10px;
}

.page-content > *:first-child {
  margin-top: 0;
}

/*Images*/
img {
    max-width: 100%;
    max-height: 100%;
}

.back {
  font-size: 0.1em;
  margin-bottom: -10px;
}

#footer {
    position: relative;
    margin-top: -150px;  /* negative value of footer height */
    height: 150px;
    clear: both;
    padding-top: 200px;
    bottom: 0;
} 

#header {
    position: relative;
    margin-top: -150px;  /* negative value of footer height */
    height: 150px;
    clear: both;
    padding-top: 200px;
    bottom: 0;
}