Css Сlasses


                    var json = {
  "elements": [
      "type": "radiogroup",
      "name": "one",
      "title": "Radiogroup question (green)",
      "choices": [ "Yes", "No" ]
      "type": "checkbox",
      "name": "two",
      "title": "Checkbox question (orange)",
      "choices": [ "One", "Two" ]
      "type": "radiogroup",
      "name": "three",
      "title": "Required question (red title)",
      "isRequired": true,
      "choices": [ "Yes", "No" ]


                    window.survey = new Survey.Model(json);
            survey.onComplete.add(function(sender) {
            document.querySelector('#surveyResult').textContent =
            "Result JSON:\n" + JSON.stringify(sender.data, null, 3);
survey.onUpdateQuestionCssClasses.add(function(survey, options) {
    var classes = options.cssClasses
    classes.mainRoot += " sv_qstn2";
    classes.root = "sq-root";
    classes.title += " sq-title"

    if (options.question.isRequired) {
        classes.title += " sq-title-required";
        classes.root += " sq-root-required";

    if (options.question.getType() === "checkbox") {
        classes.root += " sq-root-cb";
            <SurveyReact.Survey model={survey}  />, document.getElementById("surveyElement"));

<!DOCTYPE html>
<html lang="en">
    <title>Css Сlasses, Reactjs Survey Library Example</title>
<meta name="viewport" content="width=device-width" />
    <script src="https://unpkg.com/react@17.0.1/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.1/umd/react-dom.production.min.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.2.5/babel.min.js"></script>
    <script src="/DevBuilds/survey-core/survey.core.min.js"></script>
    <script src="/DevBuilds/survey-core/survey.i18n.min.js"></script>
    <script src="/DevBuilds/survey-react-ui/survey-react-ui.min.js"></script>
    <link href="/DevBuilds/survey-core/defaultV2.min.css" type="text/css" rel="stylesheet" />
    <link rel="stylesheet" href="./index.css">

<body style="margin: 0">
            <div id="surveyElement" style="display:inline-block;width:100%;">
    <div id="surveyResult"></div>

<script type="text/babel" src="./index.js"></script>


.sv_qstn .sq-root {
  border: 1px solid gray;
  border-left: 4px solid #18a689;
  border-radius: 5px;
  padding: 20px;
  margin-bottom: 30px;

.sv_qstn .sq-root-cb {
  border-left: 4px solid orange;

.sv_qstn2 .sq-root {
    border: 1px solid lightgray;
    border-radius: 5px;
    border-left: 4px solid #18a689;

.sv_qstn2 .sq-root-cb {
    border-left: 4px solid orange;

.sq-title {
  font-size: 20px;
  margin-left: 20px;

.sq-title-required {
  color: red;

.sq-label {
  margin-left: 30px;

.sq-item:nth-child(1) {
  margin-bottom: 5px;
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