body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1em;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin-right: 1em;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

section {
    padding: 2em;
}

#features {
    background-color: #f4f4f4;
}

#about {
    background-color: #e4e4e4;
}

#contact {
    background-color: #d4d4d4;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em;
    position: fixed;
    bottom: 0;
    width: 100%;
}