_examples-css-variables/2.3-css-var-demo-transform-transition.html

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      <h1 class="top-heading-text" id="topHeadingText">2. CSS Variable Demo</h1>
      
      <h2 class="subheading-text" id="subHeadingText">2.3 - Hover effect with Transform and Transition</h2>

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        <div class="button btn-warning">btn-warning </div>
        <div class="button btn-light">btn-light </div>
        <div class="button btn-dark">btn-dark </div>
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