diff --git a/style.css b/style.css
index 716a664..31494d4 100644
--- a/style.css
+++ b/style.css
@@ -28,12 +28,21 @@ p {
 	text-align: left;
 }
 
+@media screen and (min-width: 480px) {
 .center-div {
 	min-width: 480px;
 	max-width: 50%;
 	margin-left: auto;
 	margin-right: auto;
 }
+}
+@media screen and (max-width: 480px) {
+.center-div {
+	width: 100%;
+	margin-left: auto;
+	margin-right: auto;
+}
+}
 
 .btn-group {
 	margin: 0 auto;