#spline-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #0000007d;
    z-index: 1000;
    opacity: 1;
    transition: opacity 1s ease-out; /* Fade-out animation */
}
#main-content {
    display: none; /* Initially hide the main content */
    opacity: 0;
    transition: opacity 1s ease-in; /* Fade-in animation */
}
iframe {
    width: 100%;
    height: 100%;
    border: none;
}