iframe {
    width: 100%;
    height: 100%;
    border: none;
}
#hiddenContent {
    display: none;
    width: 100%;
    height: 100%;
    background-color: #f0f0f0;
    padding: 20px;
    box-sizing: border-box;
}
.game-box {
    width: 200px;
    height: 200px;
    background-color: #ccc;
    margin: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 20px;
    box-sizing: border-box;
}
#gameIframeContainer {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #fff;
    z-index: 1000;
}