body {
    margin: auto;
    width: 750px;
}

img {
    max-width: 710px;
}

nav ul {
    list-sytle-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

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 {
    padding: 10px 20px;
}

footer {
    font-size: 13px;
    color: #888;
    border-top: 1px solid #eee;
    margin-top: 25px;
    text-align: center;
    padding: 10px;
}

.alert {
    position: relative;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid #b8daff;
    boder-radius: 0.25rem;
    color: #004085;
    background-color: #cce5ff;
}

.error {
    color: red;
}