diff --git a/cps/static/css/main.css b/cps/static/css/main.css
index 3afaf7a5..571f546c 100644
--- a/cps/static/css/main.css
+++ b/cps/static/css/main.css
@@ -511,12 +511,12 @@ input:-moz-placeholder { color: #454545; }
   position: fixed;
   top: 50%;
   left: 50%;
-  width: 630px;
+  transform: translate(-50%, -50%);
+  width: 100vw;
   height: auto;
+  max-width: 630px;
   z-index: 2000;
   visibility: hidden;
-  margin-left: -320px;
-  margin-top: -160px;
 }
 
 .overlay {