Update code.module.sass to make code title sticky (#13379)

Author: ynx0

website/src/styles/code.module.sass

@@ -109,6 +109,8 @@
     box-shadow: inset 1px 1px 1px rgba(0, 0, 0, 0.25)
     background: var(--color-dark)
     margin: 1.5rem 0 0 2rem
+    position: sticky
+    left: 2rem
 
 .header
     width: 100%