Update index.html

Author: Key-code-ai

index.html

@@ -3,7 +3,7 @@
   <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link href='style.css rel='stylesheet'>
+    <link href='style.css' rel='stylesheet'>
     <title>Key-code-aiのポートフォリオ</title>
   </head>
   <body>