ten-design-vue/theme/docs/button.less

ten-vue

.demo-button-col {
  display: inline-block;
  width: 170px;
  .ten-button + .ten-button {
    margin-left: 0!important;
    margin-top: 10px;
  }
}
.demo-button-row {
  & + .demo-button-row {
    margin-top: 10px;
  }
}

.demo-button-group-base {
  >div {
    margin-top: 10px;
  }
}

.demo-button-icon {
  .demo-button-col {
    width: 130px;
  }
}