diff --git a/docs/index.html b/docs/index.html
index 4df98fc..de8e745 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -55,11 +55,16 @@
         color: #333;
       }
       header {
-        width: 640px;
+        max-width: 640px;
+        width: 100%;
+        box-sizing: border-box;
         margin: auto;
       }
       section {
-        width: 640px;
+        max-width: 640px;
+        width: 100%;
+        box-sizing: border-box;
+        padding: 0 15px;
         margin: auto;
       }
       section p {
@@ -69,7 +74,8 @@
         color: #333;
       }
       section img {
-        max-width: 640px;
+        max-width: 100%;
+        height: auto;
       }
       footer {
         padding: 0 20px;