在帖子上显示一个覆盖图像的标题
重叠滤镜
可以指定黑色叠加层的不透明度（值在0到1之间）
excerpt: "This post should [...]"
header:
overlay_image: /assets/images/unsplash-image-1.jpg
overlay_filter: 0.5 # same as adding an opacity of 0.5 to a black background
caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
actions:
- label: "More Info"
url: "https://unsplash.com"
或者指定一个RGBA的滤镜层:
excerpt: "This post should [...]"
header:
overlay_image: /assets/images/unsplash-image-1.jpg
overlay_filter: rgba(255, 0, 0, 0.5)
caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
actions:
- label: "More Info"
url: "https://unsplash.com"
或者指定纯色背景：
title: "Layout: Header Overlay with Background Fill"
header:
overlay_color: "#333"
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