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HTML

              
                

<div id="root"></div>



              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Carter+One|Montserrat");

/* font-family: "Carter One", cursive; */
body {
  width: 100%;
  height: 100%;
}
.App {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-content: stretch;
  height: 100%;
  width: 100%;
  color: red;
  font-family: "Montserrat", sans-serif;
}

.header,
.footer {
  font-family: "Carter One", cursive;
  width: 100%;
  background-color: black;
  color: #9ef;
  padding: 5px;

  text-align: center;
}

.footer {
  /* position: absolute;
  bottom: 0; */
}
.body {
  display: flex;
  width: 100%;
  padding: 50px 5px;
  justify-content: center;
  align-items: stretch;
  align-content: space-around;
  height: 100%;
  min-height: 600px;
  background-color: #222;
}

.editSide {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 45%;
  min-height: 50%;
  border-radius: 10px 0px 0px 10px;
  border: solid black 2px;
  border-right: 0px;
 background-color: #9ef
}

.editorTop {
  display: flex;
  align-items: center;
  flex-direction: column;
  border-radius: 10px 0px 0px 0px;
}

.editorTop,
.previewTop {
  height: 100px;
  width: 100%;
  text-align: center;

  margin-bottom: 5px;
  font-family: "Carter One", cursive;
  color: white;
  background-color: rgb(104, 90, 102);
}

.editorTop h1,
.previewTop h1 {
  margin: 0px;
}
.previewTop {
  margin-top: 0px;
  border-radius: 0px 10px 0px 0px;
}
#editor {
  width: 90%;
  max-width: 95%;
  height: 500px;
  font-size: 1em;
  font-weight: 500;
  background-color: #9ef;
  padding: 10px;
 }

.button {
  /* margin-bottom: 10px; */

  width: 20%;
  border: solid black 2px;
  border-radius: 5px;
  font-family: "Carter One", cursive;
  padding: 3px 10px;
}

code {
  background-color: #222;
}
#preview {
  padding: 0px 20px;
}
.previewSide {
  display: flex;
  flex-direction: column;
  width: 45%;
  border: solid black 2px;
  min-height: 50%;
  font-size: 1.2em;
  background-color: #999;
  color: white;
  border-radius: 0px 10px 10px 0px;
  border-left: 0px;
}

.previewSide a {
  color: #99eeff;
}

.markdownJSLink img {
  width: 100px;
  height: 100px;
  object-fit: fill;
  overflow: hidden;
 
}

.markdownJSLink {
  display: flex;
  align-content: center;
  justify-content: center;
  color: white;
 padding-left: 35px;
 
}
.footer i {
  font-size: 2em;
  margin: 0px 10px;
  color: #9ef;
 display: flex;
/*  flex-direction: column; */
}

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



.socialLinks  {
 display: flex;
 justify-content: center;
/*    font-size: 1.25em; */
  margin: 20px 0px;
  color: #9ef;

}

.socialLinks a {
 text-decoration: none;
}




              
            
!

JS

              
                const marked = window.marked;

marked.setOptions({
  breaks: true,
  gfm: true,
  pedantic: false
});

const renderer = new marked.Renderer();
const linkRenderer = renderer.link;
renderer.link = (href, title, text) => {
  const html = linkRenderer.call(renderer, href, title, text);
  return html.replace(/^<a /, '<a target="_blank" rel="nofollow" ');
};

class App extends React.Component{
 constructor(props) {
    super(props);
    this.state = {
      text: "",
      previewText: ""
    };
    this.onChange = this.onChange.bind(this);
    this.clearText = this.clearText.bind(this);
  }
  componentDidMount = () => {
    const previewDefault = marked(defaultMkDwn, { renderer });

    this.setState({ text: defaultMkDwn, previewText: previewDefault });
  };

  onChange(e) {
    const markdown = marked(e.target.value, { renderer });
    this.setState({ text: e.target.value, previewText: markdown });

    autoExpand();
  }
  clearText() {
    this.setState({ text: "", previewText: "" });
  }

  render() {
   return (
      <div className="App">
        <Header />
        <div className="body">
          <Editor
            onChange={this.onChange}
            clearText={this.clearText}
            text={this.state.text}
          />
          <Preview previewText={this.state.previewText} />
        </div>
        <Footer />
      </div>
    );
  }
};

class Editor extends React.Component {
  render() {
    return (
      <div className="editSide">
        <div className="editorTop">
          <h1>Editor</h1>
          <button className="button" onClick={this.props.clearText}>
            Clear
          </button>
        </div>

        <textarea
          className="autoExpand"
          name="editor"
          id="editor"
          data-min-rows="5"
          rows="5"
          onChange={this.props.onChange}
          value={this.props.text}
        />
      </div>
    );
  }
}


class Preview extends React.Component {
  render() {
    const rawMarkup = this.props.previewText;
    function createMarkup() {
      return { __html: rawMarkup };
    }

    return (
      <div className="previewSide">
        <div className="previewTop">
          <h1>Preview</h1>
        </div>

        <div id="preview" dangerouslySetInnerHTML={createMarkup()} />
      </div>
    );
  }
}

class Header extends React.Component {
  render() {
    return (
      <div className="header">
        <h1>Markdown Code Previewer</h1>
        <p>
          Enter your Markdown code on the left and see how it will render on the
          right
        </p>
      </div>
    );
  }
}

class Footer extends React.Component {
  render() {
    return (
      <div className="footer">
       
        <div className="socialLinks">
             
                <a href="https://github.com/REAOrlando" target="_blank">
                  <i className="fab fa-github" />
                </a>
                <a href="https://www.linkedin.com/in/christopheralbanesefl/" target="_blank">
                  <i className="fab fa-linkedin" />
                </a>
                <a href="https://twitter.com/albanesechris" target="_blank">
                  <i className="fab fa-twitter" />
                </a> 
           
             
        </div>
 <p>© Christopher Albanese 2018</p>
         
    

        <div className="markdownJSLink">
          <h3>Powered by MarkedJS.org</h3>
          <a href="https://marked.js.org/#/README.md#README.md" target="_blank">
            <img src="https://marked.js.org/img/logo-black.svg" alt="" />
          </a>
        </div>
      </div>
    );
  }
}

const defaultMkDwn = `# This is what h1 looks like
## Here is a h2 sub-heading
[I'm a link to google ](www.google.com  target="_blank")
this is \`inline  code\`
 Here is code block
  \`\`\`javascript
  function codeBlock() {\n
  console.log("I'm a code block")\n
  }\`\`\`
Next is an image
![logo](https://source.unsplash.com/random/100x100)
1. I'm a list item 
1. So am I
2. Me too (the number doesn't matter) 
> I'm a Blockquote

**See how bold I can be!**
~~Sometimes we all make mistakes~~
`;
const autoExpand = () => {
  $(document)
    .on("focus.autoExpand", "textarea.autoExpand", function() {
      var savedValue = this.value;
      this.value = "";
      this.baseScrollHeight = this.scrollHeight;
      this.value = savedValue;
    })
    .on("input.autoExpand", "textarea.autoExpand", function() {
      var minRows = this.getAttribute("data-min-rows") | 0,
        rows;
      this.rows = minRows;
      rows = Math.ceil((this.scrollHeight - this.baseScrollHeight) / 16);
      this.rows = minRows + rows;
    });
};


ReactDOM.render(<App />, document.getElementById('root'));





              
            
!
999px

Console