Angular Material2 md-checkbox border color

I am using Angular Material 2 and I am trying to apply css on md-checkbox. So far I managed to change background color, but there is no documentation on how to apply on border color.

My code for height-width:

:host /deep/ .mat-checkbox-inner-container{
height:15px;
width:15px;
}


code for background color on check:

:host /deep/ .mat-checkbox-checked .mat-checkbox-background {
background-color: #72addc;
}


but still cannot apply on border color.

Any help is welcome!

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