diff --git a/app/views/layouts/_signup_modal.html.erb b/app/views/layouts/_signup_modal.html.erb
index e8160f4cb..f1e543638 100644
--- a/app/views/layouts/_signup_modal.html.erb
+++ b/app/views/layouts/_signup_modal.html.erb
@@ -1,4 +1,4 @@
-<div id="global-signup-modal" class="authentication-modal crayons-modal crayons-modal--s absolute hidden">
+<div id="global-signup-modal" class="authentication-modal crayons-modal crayons-modal--s fixed hidden">
   <div class="authentication-modal__box crayons-modal__box">
     <button type="button" class="authentication-modal__close-btn close-modal-button crayons-btn crayons-btn--icon crayons-btn--ghost">
       <svg width="24" height="24" viewBox="0 0 24 24" class="crayons-icon" xmlns="http://www.w3.org/2000/svg">