body {
    font-family: 'Open Sans', Arial, sans-serif;
    background-color: wheat;
    color: darkslategray;
    line-height: 1.6;
	font-size: 17px;
	margin: 0 auto;
    padding: 10px;
}
h1, h2, h3 {
    text-align: center;
}
a.button {
    display: inline-block;
    margin: 20px 10px;
    padding: 10px 15px;
    background: #0077cc;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}
a.button:hover {
    background: #005fa3;
}
strong {
    font-weight: bold;
}
.math-display {
    text-align: center;
    margin: 20px 0;
}
.home-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  font-size: 0.9em;
  opacity: 0.6;
  z-index: 1000;
}
.home-link a {
  color: inherit;
  text-decoration: none;
}
.home-link a:hover {
  opacity: 1;
  text-decoration: underline;
}