<style>
* {
  box-sizing: border-box;
}
body {
  font-family: Arial, Helvetica, sans-serif;
}
/* Style the header */
header {
  background-color: #EEE8AA;
  float: left
  padding: 5px;
  text-align: center;
  font-size: 25px;
  color: black;
}
* {
  box-sizing: border-box;
}

.header {
  background-color: #f1f1f1;
  padding: 20px;
  text-align: center;
}
.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black;
}

.tooltip .tooltiptext {
  visibility: hidden;
  width: auto;
  background-color: #555;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  /*bottom: 50%;
  left: 70%;
  margin-bottom: 300px;
  margin-left: -300px;*/
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip .tooltiptext::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #555 transparent transparent transparent;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}

.topnav {
  overflow: hidden;
  background-color: #AFEEEE;
}
.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  color: black;
}
.topnav a:hover {
  background-color: #ddd;
  color: black;
}
/* Create two columns/boxes that floats next to each other */
nav {
  float: left;
  width: auto;
  height: auto;
  background: #AFEEEE;
  padding: 05px;
}
nav ul {
  list-style-type: none;
  padding: 0;
}
headr {
  background-color: #AFEEEE;
  float: left
  padding: 5px;
  text-align: left;
  font-size: 15px;
  color: black;
}
article {
  float: left;
  padding: auto;
  width: auto;
  background-color: #98FB98;
  height: auto; 
}

/* 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;
}
  color: #01447e;
  text-decoration: underline;
/* 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;
  }
{
  box-sizing: border-box;
}
.row {
  margin-left:-5px;
  margin-right:-5px;
}
.column {
  float: left;
  width: 50%;
  padding: 5px;
}
.row::after {
  content: "";
  clear: both;
  display: table;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
  border: 1px solid #ddd;
}
th, td {
  text-align: left;
  font-size: 100px;
  padding: 30px;
}
tr:nth-child(even) {
  background-color: #f2f2f2;
}

</style>