nav {
  margin-top: 0px;
}
ul {
  list-style-type: none;
  margin: -5px;
  padding: 10px;
  overflow: hidden;
}

li {
  float: right;
  margin-right: 10px;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #388DA3;
}
/* end of nav bar */

body {
  background: rgb(114, 175, 107);
  color: #364f1a;
  font-size: 110%;
}

a {
  color: #364F1A;
}

#content {
  padding: 40px;
  margin: 30px;
  font-family: sans-serif;
  line-height: 31px;
  background-color: rgba(114, 175, 107, 0.8);
}

#output {
  padding: 10px;
  border: double 3px black;
}

img {
  margin: auto;
  margin: 50px;
}

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