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HTML

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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h1><span>Delete this part once you copy/paste the following ID:</span> <span id="secretID">...</span></h1>

<div id="main">
<form>
  <input type="text" name="name" placeholder="name">
  <input type="email" name="email" placeholder="email">
  <button type="submit">Contact Us</button>
</form>
</div>
!

CSS
!

JS 

              
                // Initialize Firebase our database, you don't have to touch this part
var firebaseConfig = {
    apiKey: "AIzaSyBHcN0HVMwxxW-xBkXHYAm2X-kGWjxPzNk",
    authDomain: "basiccrud-ffe19.firebaseapp.com",
    databaseURL: "https://basiccrud-ffe19.firebaseio.com",
    projectId: "basiccrud-ffe19",
    storageBucket: "basiccrud-ffe19.appspot.com",
    messagingSenderId: "47974982638",
    appId: "1:47974982638:web:9a034202ca787ee47764ff"
};
firebase.initializeApp(firebaseConfig);
function getUniqueId() { //a silly function just to let you fork this codepen and have your own database
  var CODEPEN_ID = /[codepen|cdpn]\.io\/[^/]+\/(?:pen|debug|fullpage|fullembedgrid)\/([^?#]+)/;
  var id;
  if(CODEPEN_ID.test(window.location.href)) {
    id = CODEPEN_ID.exec(window.location.href)[1];
  } else if (CODEPEN_ID.test(document.location.href)){
    id = CODEPEN_ID.exec(window.location.href)[1];
  } else {
    var metas = document.getElementsByTagName('link');    
    for(i=0;i<metas.length;i++) {
      if(metas[i].getAttribute('rel') == 'canonical') {
        if(CODEPEN_ID.test(metas[i].getAttribute('href')))
        id = CODEPEN_ID.exec(metas[i].getAttribute('href'))[1];  
      }
    }
  }
  return id || `randoDB${Math.floor(Math.random()*10000000)}`;
}

//this is the "handler" for YOUR database where we can store and read values from anyone at your site!
let yourID = getUniqueId();
let yourDatabase = firebase.database().ref("contactform").child(yourID);
$("#secretID").html(yourID);

$("form").on("submit", function(evt){
  evt.preventDefault();
  let data = JSON.parse(JSON.stringify( $("form").serializeArray() ));
  let newEntry = yourDatabase.push();
  newEntry.set(data);
  $("#main").html(`Thank you for contacting us ${data[0].value}!`);
  return false;
});
!
999px

Console