Update src/content/pages/visa.mdx

href->url updated astro

Co-authored-by: Ege Akman <[email protected]>

Author: shekharkoirala

src/content/pages/visa.mdx

@@ -25,8 +25,8 @@ Every registered attendee is welcome to request a visa support letter issued by
 
 Simply fill in the form **1 week before your planned visa application**:
 
-<div style={{textAlign: "center"}}>
-<ButtonLink href="https://forms.gle/fJPPgcKFccFmAe2g9"> Visa Support Letter Request Form</ButtonLink>
+<div class="text-center">
+<ButtonLink url="https://forms.gle/fJPPgcKFccFmAe2g9"> Visa Support Letter Request Form</ButtonLink>
 </div>
 
 We will send you the completed letter via email.