Change checkbox design from square to circle

Thank you for your help in advance. I'm trying to change the mat-checkbox design from square to circle. but is a little bit hard to find a way.

Can you help me??

I can change only the background with the code below.

mat-checkbox { 
  border-radius: 100%;
  color: rgb(0,178,0);
  /deep/ .mat-checkbox-background {
    background-color: rgb(0,178,0);
  }
  /deep/ &.mat-checkbox-focused {
    .mat-ink-ripple {
      background-color: rgba(0, 178, 0, .26);
    }
  }
}