ionic-framework/scss/_spinner.scss

/**
 * Spinners
 * --------------------------------------------------
 */

.spinner {
  svg {
    width: 28px;
    height: 28px;
  }

  stroke: #444;
  fill: #444;

  &.spinner-inverse {
    stroke: #fff;
    fill: #fff;
  }
}

.spinner-android {
  stroke: #4b8bf4;
}

.spinner-ios,
.spinner-ios-small {
  stroke: #69717d;
}

.spinner-spiral {
  .stop1 {
    stop-color: #fff;
    stop-opacity: 0;
  }

  &.spinner-inverse {
    .stop1 {
      stop-color: #000;
    }
    .stop2 {
      stop-color: #fff;
    }
  }
}