Added fixed line height to the copyCodeBtn

Author: alexiglesias93

_code-blocks/webflow-theme.css

@@ -174,6 +174,7 @@ pre {
   padding: 10px 14px;
   font-family: monospace;
   font-size: 16px;
+  line-height: 1.25;
   outline: none;
   transition: all 0.15s ease;
 }