<style>
* {
  box-sizing: border-box;
}

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

/* Style the header */
header {
  background-color: #212121;
  padding: 30px;
  text-align: left;
  font-size: 35px;
  color: white;
  padding-left: 80px
}

/* Create two columns/boxes that floats next to each other */
nav {
  float: left;
  background: white;
  padding: 20px;
}

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

article {
  float: left;
  padding: 20px;
  width: 70%;
  background-color: white;
}

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

/* 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;
  }
}

.vertical-menu {
  width: 100%;
}

.vertical-menu a {
  background-color: #eee;
  color: black;
  display: block;
  padding: 12px;
  text-decoration: none;
}

.vertical-menu a:hover {
  background-color: #ccc;
}

.vertical-menu a.active {
  background-color: #212121;
  color: white;
}

#notes {
  font-family: Arial, Helvetica, sans-serif;
  border-collapse: collapse;
  width: 100%;
}
#notes td, #notes th {
  border: 1px solid #ddd;
  padding: 8px;
}

#notes tr:nth-child(even){background-color: #f2f2f2;}

#notes tr:hover {background-color: #ddd;}

#notes th {
  padding-top: 12px;
  padding-bottom: 12px;
  text-align: left;
  background-color: #212121;
  color: white;
}
</style>
