body {
    margin: auto;
    max-width: 800px;
}

button {
    display: block;
    padding: 20px 60px;
    margin: 10px 0px;
}

table {
    border: 1px solid black;
    border-collapse: collapse;
}

td {
    padding: 2px 5px;
    border: 1px solid black;
}

th {
    padding: 5px;
    border: 1px solid black;
}

.error-message {
    color: red;
}