body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #000;
    color: #fff;
}

h1 {
    text-align: center;
    padding: 20px;
    color: #fff;
}

#messier-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    grid-gap: 10px;
    padding: 10px;
}

.grid-cell {
    border: 1px solid #555;
    padding: 10px;
    cursor: pointer;
    text-align: center;
    background-color: darkgoldenrod;
    background-size: cover;
    background-position: center;
    color: #fff;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.grid-cell.starfield {
    background-size: cover;
    background-position: center;
}


.grid-cell:hover {
    background-color: rgba(255, 255, 255, 0.1);
    background-color: rgba(25, 201, 255, 0.594);
}

.modal {
    display: none; 
    position: fixed; 
    z-index: 100; 
    padding-top: 60px; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.9); 
}

.modal-content {
    display: block;
    margin: auto;
    max-width: 80%;
}

.close {
    position: absolute;
    top: 30px;
    right: 35px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}

#caption {
    text-align: center;
    color: #fff;
    padding: 10px;
    font-size: 20px;
}