fixing the MIME type error in loading override CSS file in storybook

Author: NightWing1998

.storybook/preview-head.html

@@ -1,10 +1,9 @@
-<link
-	rel="stylesheet"
-	href="assets/styles/salesforce-lightning-design-system.css"
-/>
-<link rel="stylesheet" href="assets/styles/override.css" />
+<link rel="stylesheet"
+	href="assets/styles/salesforce-lightning-design-system.css" />
+<link rel="stylesheet" href="assets/styles/override.css" type="text/css" />
 <style>
 	html {
 		background-color: transparent;
 	}
+
 </style>