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Postcard layouts are micro-layouts where you want thumbnail images, or other elements side-by-side next to a block of text. To implement a postcard layout, you need to structure your code in a very specific way, as shown in the example (add the postcard class to a div wrapper, with two divs inside it). The .postcard-left-wrap class allows the text to wrap around the image.

The caption class is used for captions beneath images, or if you want a caption below a block of text (kind of like a footnote or sidenote). The class can be applied to a <p> tag, or to a wrapper <div> or <span>.

A class used often by Drupal for "more information" links. This class can be applied onto an <a> tag directly or to a wrapper <div> or <span> around the <a> tag.

The descriptor class is used for descriptive information such as date, time, location, admission, etc. You can add this class to a tag (e.g. <p>) or to a wrapper (e.g. <span> or <div>).