img{
    display: block;
    margin-left: auto;
    margin-right: auto;
}

h2 {
	text-align:center;
	background-color:#333333;
	color:white;
}
h1{
	text-align:center;
	background-color:#333333;
	color:white;
}
ul {
  list-style-type: none;
  margin:0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 15px;
  text-decoration: none;
}
.dark{
  padding:15px;
  background:#333333;
  color:#ffffff;
  margin-top:10px;
  margin-bottom:10px;
  
}
table, th, td {
  border: 5px solid #333333;
  
}
td{
	text-align:center;
}
.center {
  margin-left: auto;
  margin-right: auto;
}
table{
	width:100%;
}