html, body {
    height: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgb(160, 160, 160);
}

.form {
    width: 100%;
    max-width: 600px;
    padding: 20px;
    box-sizing: border-box;
    border: 1px solid black;
    border-radius: 8px;
    background-color: #f9f9f9;
}