body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    height: 100%
}

header {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}

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

nav li {
    float: left;
}

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

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

main {
    max-width: 500px;
    margin: 40px auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

h1 {
    text-align: center;
}

input[type=text],
input[type=password] {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background-color: #333;
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
}

button:hover {
    background-color: #111;
}

footer {
    position: absolute;
    margin-left: 1em;
    width: 100%;
    height: 3em;
    bottom: 0;
    left: 0;
    right: 0;
}

.footer_parent {
    position: relative;
}

.letter-spacing {
    font-size: 1.5em;
    letter-spacing: 1.6rem;
}