header {
    border-bottom: 2px double black;
    background-color: burlywood; 
    margin-top: -0.5em;
 }
     
header h2{
    text-align: center;
    
}
 nav {
    background-color: crimson;
    float: left;
    width: 20%;
    clear: left;
    min-height: 1560px;
    border-right: 1px solid black;
 }

nav h3 {
    color: white;
    margin-bottom: -0.5em;
    margin-left: 0.5em;
}
 
.menu {
    width: 20%;
}

.menu li {
 list-style-type: none;
 margin-right: 0.5em;  
 margin-left: -2.5em;
 background-color: darkseagreen; 
}

.menu a { 
    color: white; 
    display: block;
    padding: 10px;
    text-decoration: none;
}

.menu a:hover {
    background-color: blueviolet;
}
 section {
    float: left;
    width: 77.8%;
    padding-left: 1em;
    background-color: dodgerblue;
 }
 
 footer {
    clear: both;
    border-top: 2px double grey;
    text-align: center;
    background-color: firebrick;
 }