zitadel/console/src/app/modules/avatar/avatar.component.scss

@import '~@angular/material/theming';

@mixin avatar-theme($theme) {
  $primary: map-get($theme, primary);
  $primary-color: mat-color($primary, 500);

  .avatar-circle {
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-transform: uppercase;
    background-color: $primary-color;
    box-sizing: border-box;
    outline: none;
    color: white;
  }
}