* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;
}

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

li a:hover {
  background-color: #111;
}
/* Style the header */
header {
  background-color:green;#666;
  padding: 30px;
  text-align: center;
  font-size: 35px;
  color: white;
  height:auto;
}

/* Create two columns/boxes that floats next to each other */
/*nav {
 // float: left;
 // width: 30%;
  //height:600px;//auto;//300px; /* only for demonstration, should be removed */
  /*background: #ccc;
  //padding: 20px;
  //clear: both;
  
}

/* Style the list inside the menu */
/*nav ul {
  list-style-type: none;
  padding: 0;
  
}*/

article {
  float: left;
  padding: 20px;
  width: 100%;
  background-color:#f1f1f1;
  //height: auto;//300px; /* only for demonstration, should be removed */
}

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

/* Style the footer */
footer {
  background-color: #777;
  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;
  }
}