zoro-cli/lib/plugins/config-web/template/src/style/layout/flex.css

https://github.com/vuejs/vue-cli

.flex-center-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.flex-between-center {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flex-v--center {
  display: flex;
  flex-flow: column nowrap;
  align-items: center;
}