Center presentation code blocks with max-width constraint

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: ofriw

website/src/components/PresentationMode/RevealSlideshow.module.css

@@ -110,7 +110,8 @@
   composes: gpuOptimized;
   font-size: 0.8em;
   line-height: 1.4;
-  margin: 0;
+  margin: 0 auto;
+  max-width: var(--pres-component-max-width);
   border-radius: 8px;
   background: #1e1e1e;
   padding: 1.2em;
@@ -129,7 +130,8 @@
   composes: gpuOptimized;
   font-size: 0.65em;
   line-height: 1.3;
-  margin: 0.5em 0 0 0;
+  margin: 0.5em auto 0 auto;
+  max-width: var(--pres-component-max-width);
   border-radius: 6px;
   background: #1e1e1e;
   padding: 1em;