#startpopup {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    pointer-events: none;
    transition: 0.3s;
    background: var(--theme);
    padding: 10px 60px;
    color: white;
    max-width: 600px;
}

#startpopup.open {
    opacity: 1;
    pointer-events: all;
}

#startpopup #close-startpopup {
    position: absolute;
    right: 15px;
    top: 15px;
    width: 50px;
    height: 50px;
    display: grid;
    place-items: center;
    transition: 0.3s;
    border: 2px solid white;
    border-radius: 50%;
    background: transparent;
    color: white;
    cursor: pointer;
    font-size: 30px;
}

#startpopup #close-startpopup:hover {
    background: white;
    color: var(--theme);
}

#startpopup h3 {
    margin: 30px 0px;
    text-align: center;
    font-weight: 300;
    letter-spacing: 1px;
    font-size: 30px
}