title: Error when trying to click a button using Selenium
body: <p>I am coding Add to cart functionality on WellGosh.com using Selenium on Python.</p>
  
  <p>I have the code get the correct size to add to cart and log into my account and get to the right shipping address, but when I try to confirm the shipping method (fedex) it will not let me click on the continue button.</p>
  
  <p>Here is an example of the code to checkout:</p>
  
  <pre><code>def Checkout():
  #brings you to your cart
  driver.get('https://wellgosh.com/checkout/cart')
  
  #clicks to checkout
  checkout=driver.find_element_by_xpath('//*[@id="shopping-cart-table"]/tfoot/tr/td/div[2]/a')
  checkout.click()
  
  #Log in
  login=driver.find_element_by_xpath('//*[@id="login-email"]')
  login.send_keys(e_mail)
  password=driver.find_element_by_xpath('//*[@id="login-password"]')
  password.send_keys(Pass)
  LogIn=driver.find_element_by_xpath('//*[@id="checkout-step-login"]/div/div[2]/div/button')
  LogIn.click()
  cont=driver.find_element_by_xpath('//*[@id="billing-buttons-container"]/button')
  cont.click()
  driver.implicitly_wait(100)
  element = driver.find_element_by_xpath('//*[@id="shipping-method-buttons-container"]/button')
  element.click()
  </code></pre>
  
  <p>I am getting this error:</p>
  
  <blockquote>
    <p>selenium.common.exceptions.ElementNotVisibleException: Message: element not visible</p>
  </blockquote>
  
  <p>This is the snippet of the HTML code:</p>
  
  <pre><code>    &lt;/script&gt;
      &lt;/div&gt;
      &lt;div class="buttons-set" id="shipping-method-buttons-container"&gt;
          &lt;p class="back-link"&gt;&lt;a href="#" onclick="checkout.back(); return false;"&gt;&lt;i class="fa fa-chevron-left plain"&gt;&lt;/i&gt;Back&lt;/a&gt;&lt;/p&gt;
          &lt;button type="button" class="button btn-continue" onclick="shippingMethod.save()"&gt;Continue&lt;/button&gt;
          &lt;span id="shipping-method-please-wait" class="please-wait zoooooom" style="display:none;"&gt;
              &lt;i class="fa fa-cog fa-spin plain"&gt;&lt;/i&gt;
          &lt;/span&gt;
      &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>