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Yes, "calibre1", "calibre2", etc, are classes. When a class is used in the CSS code in the form:
.class_name {CSS formatting here}
- that's actually shorthand for:
*.class_name {CSS formatting here}
- which is a selector that specifies that any element with the given class name should be given the listed formatting.
So... "class_name" is a class, and in the stylesheet, it can be used in the any element selector ".class_name".
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