html, body {
height: 100%;
margin: 0;
background: #ffffff; /* pure white */
}
:focus {
outline: 2px solid #000;
outline-offset: 2px;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

img {
  max-width: 100%;
  height:auto;
  margin:auto;
}

h1 {
    text-align:center;
    font-size:100px;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

h2 {
    display:block;
    text-align:justify;
    font-size:40px;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;

}


p {
    text-align:justify;
    font-size:20px;
    font-family:'Courier New', Courier, monospace;

}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #1d1c1c;
}

.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #cf3636;
  color: white;
}