fix blank page (#1057)

Co-authored-by: Tao Sun <168447269+fengju0213@users.noreply.github.com>

Author: 4pmtong

src/style/index.css

@@ -49,6 +49,8 @@ body {
   background-color: var(--bg-page) !important;
   backdrop-filter: blur(75px);
   z-index: 0;
+  position: relative;
+  isolation: isolate;
 }
 
 .blur {
@@ -419,4 +421,4 @@ code {
 .markdown-container ol {
   padding-left: 1rem;
   font-size: 12px; /* text-sm */
-}
+}