Add CSS variable example - #8
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This example show how to use CSS variables that change when a different theme is selected.
CSS variables can change at runtime, unlike Bootstrap variables, which are determined at compile time.
In this example,
src/styles.sassuses a CSS variable called--primary. The variable is given a different value in each theme stylesheet:src/default.sasssrc/solar.sasssrc/vapor.scsssrc/united.scssSelecting a different theme will load the associated stylesheet, which will update the value of the CSS variable.