body {
    margin: 0;
    background-color: black;
    color: lime;
    font-family: 'Courier New', Courier, monospace;
}

#grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(6, 1fr);
    gap: 20px;
    padding: 20px;
}

a {
    display: block;
    background-color: rgba(0, 0, 0, 0.7);
    border: 1px solid lime;
    text-align: center;
    padding: 40px;
    text-decoration: none;
    color: lime;
    font-size: 20px;
    transition: background-color 0.3s;
}

a:hover {
    background-color: rgba(0, 255, 0, 0.3);
}

.popup {
    display: none;
    position: fixed;
    background-color: orange;
    border: 2px solid black;
    padding: 10px;
    z-index: 1000;
    top: 30%;
    left: 30%;
    width: 300px;
}

.popup a {
    color: black;
    text-decoration: none;
    display: block;
}

.close {
    cursor: pointer;
    float: right;
}