body {
  background-color: lightblue;
}

h1 {
  color: navy;
  margin-left: 20px;
}

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

table {
  margin: auto;
  border: 1px;
  text-align: left;
}

ul.circle {
  list-style-type: circle;
}

th, td {
  padding: 15px;
}

.button {
border: none;
color: navy;
padding: 16px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
transition-duration: 0.4s;
cursor: pointer;
}

.button:hover {
  background-color: navy;
  color: white;
}

.topnav {
  background-color: navy;
  padding: 10px 0px;
  overflow: hidden;
  margin: 0 auto;
  width: 800px;
}

.topnav a {
  color: #ffffff;
  text-align: center;
  padding: 10px 16px;
}

.topnav a:hover {
  color: navy;
  background-color: #eba0e1;
}

.topnav a.active {
  color: navy;
  background-color: #eba0e1;
}

.center {
  padding: 10px 0px;
  overflow: hidden;
  margin: 0 auto;
  width: 800px;
}