docs(site): fix copy css cdn id

Author: andreruffert

docs/index.html

@@ -111,8 +111,8 @@ <h3>JavaScript</h3>
           </div>
           <p>Or via CDN</p>
           <div class="copy-code">
-            <syntax-highlight language="html" id="copy-usage-cdn">&lt;script type="module" src="https://unpkg.com/syntax-highlight-element@latest/dist/syntax-highlight-element.js"&gt;&lt;/script&gt;</syntax-highlight>
-            <clipboard-copy for="copy-usage-cdn" class="button">Copy</clipboard-copy>
+            <syntax-highlight language="html" id="copy-usage-cdn-js">&lt;script type="module" src="https://unpkg.com/syntax-highlight-element@latest/dist/syntax-highlight-element.js"&gt;&lt;/script&gt;</syntax-highlight>
+            <clipboard-copy for="copy-usage-cdn-js" class="button">Copy</clipboard-copy>
           </div>
           <h3>HTML</h3>
           <div class="copy-code">
@@ -125,8 +125,8 @@ <h3>CSS</h3>
           <p>Make sure to load a theme e.g. <code>syntax-highlight-element/themes/prettylights.css</code>.</p>
           <p>Or via CDN</p>
           <div class="copy-code">
-            <syntax-highlight language="html" id="copy-usage-cdn">&lt;link rel="stylesheet" href="https://unpkg.com/syntax-highlight-element@latest/dist/themes/prettylights.css"&gt;</syntax-highlight>
-            <clipboard-copy for="copy-usage-cdn" class="button">Copy</clipboard-copy>
+            <syntax-highlight language="html" id="copy-usage-cdn-css">&lt;link rel="stylesheet" href="https://unpkg.com/syntax-highlight-element@latest/dist/themes/prettylights.css"&gt;</syntax-highlight>
+            <clipboard-copy for="copy-usage-cdn-css" class="button">Copy</clipboard-copy>
           </div>
         </article>
       </section>