body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    width: 100%
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

nav ul li a:hover {
    text-decoration: underline;
}

main {
    padding: 2rem;
    text-align: center;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 18px;
    text-align: left;
}

table thead th {
    background-color: #333;
    color: #fff;
    padding: 10px;
}

table tbody td,
table thead th {
    border: 1px solid #ddd;
    padding: 8px;
}

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

table tbody tr:hover {
    background-color: #f1f1f1;
}

.red {
    color: red;
    /* Jasny czerwony */
}

.green {
    color: green;
    /* Jasny zielony */
}