how do I locate the btn by class name?
Is it button class name dynamic or static? 
How if you try choose By.CssSelector?
You can find element by copy selector in element
I have this html code:
<button class="_2ic5v"><span aria-label="Like" class="glyphsSpriteComment_like u-__7"></span></button>
I am trying to locate all the elements that meet this class with phyton, and selenium webdriver library:
likeBtn = driver.find_elements_by_class_name('_2ic5v')
but when I print 
likeBtn
it prints 
[]
I want to locate all of the buttons that much this div/span class, or aria-label
how do I do that successfully? Thanks in advance
update - when I do copy Xpath from page the print stays the same