diff --git a/files/templates/sign_up.html b/files/templates/sign_up.html
index 5257792947..027a30c613 100644
--- a/files/templates/sign_up.html
+++ b/files/templates/sign_up.html
@@ -108,7 +108,7 @@
 					<div class="h-captcha" data-sitekey="{{ hcaptcha }}"></div>
 					{% endif %}
 
-					<button class="btn btn-green" id="register_button">
+					<button class="btn btn-green w-full" id="register_button">
 						Create account
 					</button>