fix background

src/styles/styles.less

@@ -11,18 +11,19 @@
 
 html {
   scroll-behavior: smooth;
+  overflow: hidden;
 }
 
 body {
   margin: 0;
   font-family: Roboto, "Helvetica Neue", sans-serif;
   font-size: 14px;
-  overscroll-behavior-y: none;
   color: #333;
 
-  background-attachment: fixed;
   background-image: url("/assets/background.jpg");
   background-size: cover;
+  background-position: center;
+  overflow: auto;
 }
 
 p {
@@ -67,7 +68,7 @@ a {
 }
 
 html, body {
-  height: 100%;
+  height: 100vh;
 }
 
 body {