body {
    font-family: Arial, sans-serif;
    margin: 30px;
}

.container {
    width: 500px;
}

h3 {
    text-align: center;
    color: #008080;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
}

th, td {
    border: 1px solid #ccc;
    padding: 8px 12px;
    text-align: center;
}

th {
    background-color: #f2f2f2;
    color: #008080;
}

.btn-group {
    text-align: center;
}

button {
    padding: 6px 12px;
    margin: 0 5px;
    cursor: pointer;
}