header {
  display: block;
  background-color: lightgray;
  width: 100%;
  height: 50px;
  color: white;
}

#headerButtons {
  list-style-type: none;
  margin: 5px;
  padding: 5px;
}

.navButton {
  float: right;
  padding: 5px;
}

footer {
  display: block;
  width: 100%;
  height: 50px;
  background-color: lightgray;
  color: white;
}

img {
  max-width: 100%;
  height: auto;
  padding: 20px;
}

#body {
  display: block;
  background-color: rgb(210, 235, 210);
  width: 100%;
  color: gray;
  padding: 20px;
}