style: adjust layout and styling for better alignment

worker.js

@@ -963,8 +963,14 @@ function getHTML() {
     '      backdrop-filter: blur(5px);',
     '      z-index: 900;',
     '      border-top: 1px solid rgba(0, 0, 0, 0.1);',
+    ' display: flex;',           
+    '      justify-content: center;', 
+    '      align-items: center;',     
     '    }',
-
+'    .footer-content {',
+'      text-align: center;',      
+'      width: 100%;',
+'    }',
     '    .powered-by {',
     '      color: #7f8c8d;',
     '      font-size: 0.9rem;',