dialog::backdrop {
    background-color: rgba(0,0,0,0.6);
}

dialog[open] {
    position: fixed;
    width: 70%;
    max-width: 750px;
    top: 10px;
}


dialog#dialog1 {
    padding: 15px;
    border-radius: 5px;
    font-size: 1.2em;
    text-align: justify;
}