I use this code in order to set the background-color:

<ion-grid style="margin-left:2px;margin-right:2px;margin-top:5px;">
  <ion-row *ngFor="let scheduleRecordDayCompendium of scheduleRecordDayCompendiums; let i = index" 
       [style.color]="getLineColor(scheduleRecordDayCompendium)">
     <ion-col>

This is the getLineColor function:

getLineColor(scheduleRecordDayCompendium) {
  switch(scheduleRecordDayCompendium.day) {
  case 'SATURDAY':
    return '#00f';
  case 'SUNDAY':
    return '#f00';
 }
return '#000';

}

with [style.color] it works fine but how can I make it work with [style.backgound-color]?