body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 50px;
}

input {
    padding: 8px;
    margin: 10px;
    width: 200px;
    font-size: 16px;
}

button {
    padding: 8px 16px;
    font-size: 16px;
    cursor: pointer;
}

.error {
    color: red;
    margin-top: 10px;
}

.hidden {
    display: block;
}

.table-container {
    margin-top: 20px;
    overflow-x: auto;
}

table {
    width: 80%;
    margin: auto;
    border-collapse: collapse;
}

th,
td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

th {
    background-color: #4caf50;
    color: white;
}

tr:nth-child(even) {
    background-color: #f2f2f2;
}