#fb_container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: opacity 1s ease;
    backdrop-filter: blur(30px) brightness(0.81);
    z-index: 9999;
}

.first_button {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    font-size: 24px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    background: 0;
    border: none;
    cursor: pointer;
}