body {
    font-family: Times New Roman, sans-serif;
    background-color: #f0f0f0;
}
header {
    background-color: #808080  ;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}
footer {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}
nav {
    background-color: #444;
    color: #ffffff;
    padding: 10px;
}
nav ul {
    list-style-type: none;
    padding: 0;
}
nav ul li {
    display: inline;
    margin-right: 10px;
}
nav ul li a {
    color: #f0f0f0;
    text-decoration: none;
}
.content {
    padding: 20px;
}
h1 {
    color: #333333;
}
img {
    max-width: 100%;
    height: auto;
}