Add style to Remove rounded corners in Chrome 62+

static/scss/forms/_buttons.scss

 // This file is part of website-defaults
 // Copyright (C) 2016-2017 eyeo GmbH
 //
 // website-defaults is free software: you can redistribute it and/or
 // modify it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
 //
 // website-defaults is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 11 matching lines @@
  ******************************************************************************/
 
 button
 {
   margin: 0px;
   font: inherit;
 
   /* Show the overflow in IE and Edge */
   overflow: visible;
 
+  /* Remove rounded corners in Chrome 62+ */
+  border-radius: 0;
+
   /* Remove the inheritance of text transform in Edge, Firefox, and IE. */
   text-transform: none;
 }
 
 /**
  * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
  *    controls in Android 4.
  * 2. Correct the inability to style clickable types in iOS and Safari.
  */
 
@@ skipping 18 matching lines @@
 
 /* Restore the focus styles unset by the previous rule. */
 
 button:-moz-focusring,
 [type="button"]:-moz-focusring,
 [type="reset"]:-moz-focusring,
 [type="submit"]:-moz-focusring
 {
   outline: 1px dotted ButtonText;
 }