<el-form-item label="证书版本" prop="certificateType">
          <el-radio-group v-model="form.certificateType" size="small">
            <el-radio-button label="试用版">试用版</el-radio-button>
            <el-radio-button label="正式版">正式版</el-radio-button>
          </el-radio-group>
 </el-form-item>

CSS部分

<style scoped>
::v-deep .el-radio-button__orig-radio:checked+.el-radio-button__inner {
  color: #0052D9;
  background-color: #FFFFFF;
  border-color: #0052D9;
  -webkit-box-shadow: -1px 0 0 0 #0052D9;
  box-shadow: -1px 0 0 0 #0052D9;
}
</style>

最终效果