.header {

  text-align: center; /* center the text */
  background: black; /* green background */
  color: white; /* white text color */
  position: relative;
  text-align: center;
}

/* Increase the font size of the <h1> element */
.header h1 {
  font-size: 40px;
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Style the top navigation bar */
.navbar {

  background-color: #333; /* Dark background color */
}

/* Dropdown Button */
.dropbtn {
  background-color: black;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
  position: relative;
  display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: black;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* Links inside the dropdown */
.dropdown-content a {
  color: white;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

/* Ensure proper sizing */
* {
  box-sizing: border-box;
}

/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: grey;}

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {display: block;}

/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn {background-color: grey;}

/* Column container */
.row {
  display: flex;
  flex-wrap: wrap;
}

/* Create two unequal columns that sits next to each other */
/* Sidebar/left column */
.side {
  flex: 30%; /* Set the width of the sidebar */
  background-color: #f1f1f1; /* Grey background color */
  padding: 20px; /* Some padding */
}

/* Main column */
.main {
  flex: 70%; /* Set the width of the main content */
  background-color: white; /* White background color */
  padding: 20px; /* Some padding */
}

/* Responsive layout - when the screen is less than 700px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 700px) {
  .row {
    flex-direction: column;
  }
}

/* Responsive layout - when the screen is less than 400px wide, make the navigation links stack on top of each other instead of next to each other */
@media screen and (max-width: 400px) {
  .navbar a {
    float: none;
    width: 100%;
  }
}

.footer {
  padding: 20px; /* Some padding */
  text-align: center; /* Center text*/
  background: #ddd; /* Grey background */
}