/* Save this file as css/style.css */
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
}

.header, .footer {
background-color: #333;
color: white;
text-align: center;
padding: 10px 0;
}

.sticky {
position: sticky;
top: 0;
z-index: 100;
}

.menu {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}

.menu li {
float: left;
}

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

.menu li a:hover {
background-color: #111;
}

.column {
float: left;
width: 33.33%;
padding: 15px;
}

.row:after {
content: "";
display: table;
clear: both;
}

.main-content {
  vertical-align: top;
}


@media screen and (max-width: 600px) {
.column {
width: 100%;
}
}