title: how to located element using selenium web driver
body: <p>I am trying to find an element which is a button called select.</p>
  <p><a href="https://i.stack.imgur.com/5gIUD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5gIUD.png" alt="enter image description here" /></a></p>
  <p>what I have is :</p>
  <pre><code>select_button = driver.find_elements_by_class_name('tri_mat-button-base')  
  select_button[1].click()
  </code></pre>
  <p>but it does not do what it suppose to. Any one can help? Thanks!</p>