:root {
    --page-bg-img: url("/assets/bg/default.png");
    --page-bg-repeat: repeat;
    --page-bg-size: auto;
    --page-bg-position: center;
    --page-bg-attachment: fixed; /* opcional */
}

body {
    background-image: var(--page-bg-img);
    background-repeat: var(--page-bg-repeat);
    background-size: var(--page-bg-size);
    background-position: var(--page-bg-position);
    background-attachment: var(--page-bg-attachment);
}

.dialog-border {
    border: 48px solid transparent;
    border-image-source: var(--border-img);
    border-image-slice: 40 fill;
    border-image-width: 40px;
    border-image-repeat: stretch;
    display: inline-block;
    color: yellow;
}