* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
}

/* Style the header */
header {
  background-color: #2950D6;
  padding: 30px;
  text-align: center;
  font-size: 35px;
  color: white;
}

/* Create two columns/boxes that floats next to each other */
nav {
  float: right;
  width: 20%;
}

/* Style the list inside the menu */
nav ul {
  list-style-type: disc;
  padding:50px;
}

nav ul li a{ 
  color:black;
}

article {
  float: left;
  width: 80%;
  background-color: white;
}

#myDIV1 {
  display:none;
  width: 100%;
  padding: 20px;
  text-align: left;
  background-color: white;
  margin-top: 0px;
}

#myDIV2 {
  display:none;
  width: 100%;
  padding: 20px;
  text-align: left;
  background-color: white;
  margin-top: 0px;
}

#myDIV3 {
  display:none;
  width: 100%;
  padding: 20px;
  text-align: left;
  background-color: white;
  margin-top: 0px;
}

#myDIV4 {
  display:none;
  width: 100%;
  padding: 20px;
  text-align: left;
  background-color: white;
  margin-top: 0px;
}

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

/* Clear floats after the columns */
section:after {
  content: "";
  display: table;
  clear: both;
}

/* Style the footer */
footer {
  background-color: #4C6AD1;
  padding: 10px;
  text-align: center;
  color: white;
}

/* Responsive layout - makes the two columns/boxes stack on top of each other instead of next to each other, on small screens */
@media (max-width: 600px) {
  nav, article {
    width: 100%;
    height: auto;
  }
}