Template:Wikiversary/styles.css

.centered-bg-table {
    margin-left: auto; 
    margin-right: auto;
    border-collapse: collapse;
    background: url("https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/WP25_Graphics_of_Dinosaur_and_Book.png/500px-WP25_Graphics_of_Dinosaur_and_Book.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    color: white; /* Adjust text color for readability */
}

.centered-bg-table th, 
.centered-bg-table td {
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 10px;
    text-align: center;
}