Publish button does not become active after an edit

editing
#1

I created a file, “index.html”, which is in the same folder as my Sitecake folder and sitecake.php. Here is the file (I left out much of the stuff between <head> and </head>:

<!DOCTYPE HTML>
<html>
<head>
<title>SiteCake test</title>

<style>
.sc-content{color: black;}
</style>

</head>

 <body>
 <div class="sc-content">
 <p>some test text</p>
 </div>
 </body>
 
 </html>

I get the edit bar by going through …example.com/sitecake.php. and logging in. However, when I make a change to the text, the publish button remains inactive and my change (just making the word “text” to be bold) does not take hold.

What am I missing?