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src/components/Header.vue

@@ -25,6 +25,10 @@ export default {
   justify-content: space-between;
   align-items: center;
   padding: 0 calc((100% - 1200px) / 2);
+  position:fixed;
+  left: 0;
+  right: 0;
+  z-index: 999;
   .logo{
      width: 200px; 
   }