diff --git a/lib/index.styl b/lib/index.styl
index 79d6bc9..abb28ee 100644
--- a/lib/index.styl
+++ b/lib/index.styl
@@ -48,15 +48,13 @@ p {
 }
 
 .footer {
-    width: 640px
+    width: 100%
     height: 60px
     text-align: center
     color: gray
     padding: 10px 0 10px
-    position: fixed
+    position: relative
     bottom: 0
-    left: calc(50vw - 320px)
-    right: calc(50vw - 320px)
     border-radius: 5px 5px 0 0
     background white
 
@@ -91,8 +89,6 @@ p {
 }
 
 .drop-zone {
-    width: 100%
-    height: 100%
 
     .drop-zone-overlay {
         position: fixed