A simple css class for responsive button.

blue_gradient_background.css

/*
  Generated by http://www.colorzilla.com/gradient-editor
  Colors: #008FCA, #33B2E6
*/
.blue_gradient_background {
  background: #33b2e6; /* Old browsers */
  background: -moz-linear-gradient(top,  #33b2e6 0%, #008fca 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#33b2e6), color-stop(100%,#008fca)); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  #33b2e6 0%,#008fca 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  #33b2e6 0%,#008fca 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  #33b2e6 0%,#008fca 100%); /* IE10+ */
  background: linear-gradient(to bottom,  #33b2e6 0%,#008fca 100%); /* W3C */
  /* filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#33b2e6', endColorstr='#008fca',GradientType=0 ); /* IE6-9 */
}