d2-admin-start-kit/src/assets/style/theme/violet/index.scss

@import './setting.scss';
@import '../theme.scss';

.theme-#{$theme-name} {
  .d2-layout-header-aside-group {
    background: #bc00e3;
    background: linear-gradient(120deg, #bc00e3 0%, #4EFFFB 100%);
  }
}