Python Selenium Find Button

I have a Website were I want to click a button, but I can’t find in the button in the HTML script, what I have to write in my Python script?
Later I want to have something like

driver.find_element_by_css_selector()

Now I don’t know what I have to put in there

<div class=”custom-col” onclick=”Ajax(‘routes.php’,’main’);mainMenuLoad(‘mainMenuRoutes’);” style=”width: 20%;”>
<img src=”assets/img/icons/route-icon-shade.png” class=”btn-action” id=”mainMenuRoutes” style=”height:40px;”>
</div>

I hope you understood my question because I am not a native speaker

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