I am trying to make some automation software automating Chrome. I can navigate to the page, and the page has a button declared like this in the code:

<div class="bn_diff_image">
   <a href="javascript:setMode('ImageText', 0);"></a>
</div>

The class shows an image of a button. I need to click that button (to execute the javascript) but I can't get it to work. Here is the code I have tried:

chromeDriver.ExecuteJavaScript("javascript:setMode('ImageText', 0)")

This returns an error that setMode cannot be found. I put a Thread.Sleep in the code to ensure the page was fully loaded before calling this, it made no difference

I tried accessing the button via CSS selector

chromeDriver.FindElement(By.CssSelector("a[href*=\'ImageText', 0']")).Click()

It can't find the selector and fails

I tried finding the div by classname and clicking on that

chromeDriver.FindElement(By.ClassName("bn_diff_image")).Click()
    '

but it fails saying it can't find the element

How in the world can I click on this link or run that javacript on the page?