Change table class in view block Is it possible to change the table class when using drupal's format table for view. It seems to allow me to only change the row class.
go to core\themes\stable\templates\views folder and copy views-view-table.html.twig or .tpl.php (depending if you are on Drupal 8 or 7)

copy the file and re-name it views-view-table--[view-name]--[machine-name].html.twig or .tpl.php

Then edit the file and add the class

If Drupal 8 

{%
  set classes = [
    'cols-' ~ header|length,
    responsive ? 'responsive-enabled',
    sticky ? 'sticky-enabled',
    'my-custom-class',
  ]
%}
&lt;table{{ attributes.addClass(classes) }}&gt;


If Drupal 7

&lt;table &lt;?php if ($classes) { print 'class="'. $classes . ' . ' ' . 'my-custom-class"'; } ?&gt;&lt;?php print $attributes; ?&gt;&gt;


Now place your template file in your theme's template folder.

Clear/flush the cache to see changes.