@charset "utf-8";
html {
    background-image: url("background.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}
body {
    font-family: Verdana, Geneva, sans-serif;
    color: rgb(91, 91, 91);
    background-color: ivory;
    width: 90%;
    margin-left: auto;
    margin-right: auto;
}

h1, h2 {
    text-shadow: 4px 6px 5px gray;
}

h2 {
    font-size: 1.3em;
}
 
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

nav li {
    display: block;
    width: 20%;     
    float: left;
}
nav a {
    display: block;
    background-color: hsl(210, 30%, 80%);
    line-height: 2.8em;
    text-decoration: none;
    text-align: center;
    color: hsl(210, 50%, 30%);
}

nav a:hover {
    background-color: hsl(210, 70%, 20%);
    color: white;
}
main {
    padding: 0 20px; 
    margin-top: 35px; 
}
body > footer {
    background-color: hsl(210, 30%, 80%);   
    color: rgba(102, 102, 102, 0.6);        
    font-weight: bold;
    font-size: 0.9em;
    line-height: 3em;
    text-align: center;
    margin-top: 10px;
    padding: 10px;
     clear: both;
}
ol {
    list-style-type: upper-roman;
}
main > img {
    width: 25%;
    padding: 25px;
}
main > img {
    width: 25%;
    padding: 25px;
    float: right;
}
header img {
    width: 100%;
}