* {
  box-sizing: border-box;
}

body {
  margin: 0px;
  background-color: #6699ff;
}

.header {
  background-color: #6699ff;
  padding: 10px;
  color: #000000;
  text-align: center;
  font-family: serif;
  font-size: 36px;
}

p {
  text-align: justify;
  font-family: serif;
  font-size: 16px;
  }

.nav {
  overflow:hidden ;
  background-color: #fff;
}

.nav a {
  float: left;
  display: block;
  color: #000;
  text-align: center;
  padding: 10px 15px;
  margin-left: 10px;
  font-size: 20px;
  text-decoration: none;
}

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

.image1 {
  width: 300px ;
  height: 150px;
  float: left;
  padding: 10px 10px 10px;
}

.image2 {
  width: 300px ;
  height: 150px;
  float: center;
  padding: 10px 10px 10px;
}

.section {
  padding:  10px 5px 15px;
  text-align: center;
   font-size: 18px;
  color: #000;
  background-color: #6699ff;
}

.footer {
  background-color: #fff;
  padding: 10px;
  text-align: center;
  color: #000;
   font-size: 18px;
}