.grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 10px;
    width: 100%;
    max-width: 600px;
}

.grid-item {
    background-color: #ddd;
    border: 1px solid #999;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    font-size: 14px;
}

.grid-item.loaded {
    background-color: #4CAF50;
    color: white;
}