.slider_wrapper {
	width: 60%;
	margin: 0 auto;
}
@media only screen and (max-device-width: 800px), screen and (max-width: 800px) {
  .slider_wrapper {
    width: 80%;
  }  
}

@media only screen and ( max-width: 40em ) /* 640 */
{
  .slider_wrapper {
    width: 100%;
  }  
}

.slider_block {
	width: 100%;
	margin: 0 auto;
}