Dcat-Admin/resources/assets/dcat/sass/components/_slider.scss

.customizer {
  width: 450px;
  right: -450px;
  box-shadow: $menu-shadow;
  z-index: 48;

  .customizer-content {
    width: 450px;
  }
}

@media (max-width: 576px) {
  .customizer {
    width: 410px;
    right: -410px;

    .customizer-content {
      width: 410px;
    }
  }
}