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&#x3C;div class=&#x22;border-white-60&#x22;&#x3E;&#x3C;/div&#x3E;
&#x3C;div class=&#x22;border-white-70&#x22;&#x3E;&#x3C;/div&#x3E;
&#x3C;div class=&#x22;border-white-80&#x22;&#x3E;&#x3C;/div&#x3E;
&#x3C;div class=&#x22;border-white-90&#x22;&#x3E;&#x3C;/div&#x3E;
</code></pre>
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