body {
    font-family: Arial, sans-serif;
}
h1 {
   text-align: center;
}

table {
    width: 60%;
    margin: 20px auto;
    border-collapse: collapse;
}

th, td {
    padding: 15px;
    border: 1px solid #ddd;
    text-align: center;
}

th {
    cursor: pointer;
    background-color: #f4f4f4;
}

th:hover {
    background-color: #ddd;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}