Notion-like banner images without a plugin

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Huh, odd! I use the Minimal theme primarily, but it works in every theme I’ve tried (including the default one). I also tried the Sandbox vault and it works there. Maybe I changed something else that I’m forgetting. Here’s the full file that I’m using:

:root {
    --banner-image-height: 120px;
}

.banner-image > .markdown-preview-section {
    margin-top: var(--banner-image-height) !important;
}

.banner-image.markdown-preview-view [data-callout="banner-image"],
.banner-image.markdown-preview-view .image-embed {
    position: absolute; 
    top: 0;
    left: 0;
    right: 0; 
    height: var(--banner-image-height) !important; 
    margin: 0px !important;
    padding: 0px;
    background-color: transparent;

    .callout-icon {
        display: none;
    }
}

.banner-image.markdown-preview-view [data-callout="banner-image"] img {
    min-height: var(--banner-image-height) !important; 
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.banner-image [data-callout="banner-image"] .callout-icon {
    display: none;
}
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