How to add admin login credentials to indexeddb storage?

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CSS

HTML

I am trying to make my admin web page so that it has one set of login credentials already set in. This is so when I log in, it can check against that to see if I have matched the saved credentials. Is there a way to add this to the IndexedDB storage from the code upon launching the webpage? How would I code this?

This is my code so far:

<div id="container">
<form action="login.php" method="get">
	Username:<br>
	<input type="text" name="username" required="required"> <br>
		
	Password:<br>
	<input type="password" name="password" required="required"> <br><br>
		
	<input type="submit" value="Login">
</form><br>

What I have tried:

I am new to HTML so am not sure what to try...
Any help will be greatly appriciated