Changing border color in mat-form-field

Question

I am using angular material mat-form-field. I have a dark background, and therefore am trying to change the border of the form-field to white. But I am not able

Answer 1

try this , add/remove ::ng-deep if required

 ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-end {
                border-radius: 1px !important;
                border: 1px solid  red;
                border-left:none;
              }
            ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-start {
                border-radius: 1px !important;
                border: 1px solid red;
                border-right:none;
              }
              ::ng-deep .mat-form-field-appearance-outline .mat-form-field-outline-gap {
                border-radius: 1px !important;
                border-bottom: 1px solid   red;
              }