ngx-admin/src/app/@theme/styles/default/_misc.scss

@mixin ngx-misc-theme($theme-name) {
  agm-map {
    .agm-map-container-inner {
      height: calc(#{$nga-card-height-xmedium} - 50px);
    }
  }

  .leaflet-container {
    height: calc(#{$nga-card-height-xmedium} - 50px);
  }

  .echart {
    height: calc(#{$nga-card-height-xmedium} - 50px);
  }
}