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

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

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

nav li {
    display: inline-block;
    margin-right: 20px;
}

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

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2em;
}

h1 {
    margin-bottom: 10px;
}

form {
    margin-top: 20px;
}

input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    height: 40px;
    margin-bottom: 20px;
    padding: 10px;
    border: 1px solid #ccc;
}

input[type="submit"] {
    width: 100%;
    height: 40px;
    background-color: #333;
    color: #fff;
    border: none;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #555;
}