fix styles overlapping

customize.dist/src/less2/pages/page-index.less

@@ -13,6 +13,7 @@
     color: #FFF;
     background: linear-gradient( @background_darker, @background_lighter ), url('/customize/bg14.jpg');
     background-size: cover;
+    background-position: center;
     min-height: 100vh;
     display: flex;
     flex-direction: column;