diff --git a/browser/main/global.styl b/browser/main/global.styl
index cfeb0495..1dee7526 100644
--- a/browser/main/global.styl
+++ b/browser/main/global.styl
@@ -65,6 +65,10 @@ modalBackColor = transparentify(white, 65%)
 .ModalBase
   fixed top left bottom right
   z-index modalZIndex
+  display flex
+  align-items center
+  justify-content center
+
   &.hide
     display none
   .modalBack
diff --git a/browser/styles/index.styl b/browser/styles/index.styl
index 9322259f..6a911bae 100644
--- a/browser/styles/index.styl
+++ b/browser/styles/index.styl
@@ -123,7 +123,7 @@ $modal-border-radius = 5px
 modal()
   position relative
   z-index $modal-z-index
-  margin $modal-margin
+  width 100%
   background-color $modal-background
   overflow hidden
   border-radius $modal-border-radius