share_activity/components/customPreviewImage/customPreviewImage.wxss

/* components/customPreviewImage/customPreviewImage.wxss */
.preview-body {
    width: 100vw;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 10001;
    background: rgba(0, 0, 0, 0.9);
}
.preview-body image {
    width: 100%;
    height: 100%;
}