body {
    font-family: Arial, sans-serif;
    background: #000;
    color: #fff;
    margin: 0;
    padding: 0;
}
/*.container {*/
/*    width: 100%;*/
/*    max-width: 400px;*/
/*    margin: 40px auto;*/
/*    background: #555555;*/
/*    color: #fff;*/
/*    padding: 20px 10px;*/
/*    border-radius: 8px;*/
/*    box-shadow: 0 2px 8px rgba(0,0,0,0.5);*/
/*}*/
h1 {
    font-size: xxx-large;
    text-align: center;
    color: #fff;
}h2 {
    text-align: center;
    color: #fff;
}
form {
    display: flex;
    flex-direction: column;
}
input[type="submit"] {
    background: #222;
    color: #fff;
    border: 1px solid #444;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
    transition: background 0.2s, color 0.2s;
}
input[type="submit"]:hover {
    background: #fff;
    color: #000;
}
a {
    color: #4fc3f7;
    text-decoration: none;
}
a:hover {
    color: #fff;
    text-decoration: underline;
}
.error {
    color: #fff;
    background: #d8000c;
    padding: 8px;
    border-radius: 4px;
    margin-top: 10px;
    text-align: center;
}