ant-design/site/theme/static/nprogress.less

#nprogress {
  .bar {
    background: @primary-color;
  }

  .peg {
    box-shadow: 0 0 10px @primary-color, 0 0 5px @primary-color;
  }

  .spinner-icon {
    border-top-color: @primary-color;
    border-left-color: @primary-color;
  }
}