.panel-grid.panel-no-style {
  margin-left:-15px;
  margin-right:-15px;
}

@media only screen and (max-width: 768px) {

}

@media only screen and (max-width: 600px) {
  .panel-grid.panel-no-style {
    margin-left: 0;
    margin-right: 0;
  }
}