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HTML 

              
                <!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>Currency Converter</title>
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
      <link rel = "stylesheet" href = "main.css">
  </head>

<header>
  <div id = "header-div">
    <h1 class = "text-center">Your Currency Converter</h1>
  </div>
</header>

<body>
  <div class = "container-fluid">

    <div class = "row">
      <div id  = "currentContainer" class = "col-lg-6">
        <label>How much money do you have?</label>
        <select id = "currentCurrencyType">
          <option value="£">£ Brittish Pounds</option>
          <option value="$">$ American Dollar</option>
          <option value="€">€ Euro</option>
          <option value="¥">¥ Japanese Yen</option>
          <option value="$">$ Canadian Dollar</option>
          <option value="CHF">CHF Swiss Franc</option>
        </select>
        <input id = "currentMoney"></input>
      </div>
     
      <div id = "newContainer" class = "col-lg-6">
        <label>Current transfer rate:</label>
        <select id = "newCurrencyType">
          <option value="£">£ Brittish Pounds</option>
          <option value="$">$ American Dollar</option>
          <option value="€">€ Euro</option>
          <option value="¥">¥ Japanese Yen</option>
          <option value="$">$ Canadian Dollar</option>
          <option value="CHF">CHF Swiss Franc</option>
        </select>
        <input id = "transferRate"></input>
      </div>
    </div>

    <div class = "row">
        <div id = "valueContainer" class = "col-lg-6">
          <label>New Currency Value:</label>
          <input id = "newValue" disabled = "true"></input>
        </div>
        <div id = "btnContainer" class = "col-lg-6">
          <button id = "calculateBtn" class = "btn btn-primary">Calculate</button>
          <button id = "clearBtn" class = "btn btn-danger">Clear</button>
        </div>
    </div>

 <!-- Place to store values in an array -->

 <div id = "previousDiv" class = "container-fluid row">
  <label>Previous Values:</label>
   <div id = "arrayDiv" class = "container col-lg-12">
   </div>
 </div>


  </div>




  <script src = "app.js"></script>
</body>
</html>
!

CSS 

              
                header{
    margin-top: -20px;
    padding-bottom: 20px;
    background-color: #d8dce0;
}

h1{
	padding-top: 20px;
	text-decoration: underline;
}

select{
	margin: 0 5px 0 5px;
}

#currentContainer, #newContainer{
	padding: 40px 20px 20px 40px;
}

#valueContainer, #btnContainer{
	padding: 40px 10px 5px 40px;
}

#arrayDiv{
    height: 400px;
    width: 100%;
    /*Stops scroll bar appearing*/
    overflow-x: hidden;
    /*Wraps word to next line instead of continuing on same line*/
    word-wrap: break-word; 
    background-color: #e0dbd8;

    border: 5px inset;
    box-shadow: 5px 5px #888

    font-size: 20pt;
}

#previousDiv{
    padding-top: 20px;
    padding-bottom: 20px;
}


/*Media Queries*/
@media only screen and (max-width: 400px) {
    #newContainer label{
    	padding-right: 100px;	
    }

    #btnContainer{
        padding-left: 120px;
    }
}

@media only screen and (min-width: 1200px) {

    #btnContainer{
    	margin-left: -270px;
    }
}
!

JS 

              
                //Executes on page load.
document.addEventListener('DOMContentLoaded', (e) => {
const calculateBtn = document.getElementById('calculateBtn');
//Create array to store values
});

let valueArray = new Array();

//Calculate value function
function calculateValue(valueOne, valueTwo){
	const value = (valueOne * valueTwo).toFixed(2);
	return value;
}
//Adds value onto an array
function pushToArray(value, array){
    array.push(value);
    return newValue
}

//Executes when calculate button is clicked
calculateBtn.addEventListener('click', (e) => {
    //Take value of current currency input and type selection and assign it to variable
    const currentCurrencyType = document.getElementById("currentCurrencyType").value;
    const currentMoney = document.getElementById('currentMoney').value;

    //Take value of current transfer rate and currency type store it as variable
    const newCurrencyType = document.getElementById("newCurrencyType").value;
    const transferRate = document.getElementById('transferRate').value;

    //Check that inputs are numbers
    	//If false displays error
    	//If true executes code
	if(isNaN(currentMoney) || isNaN(transferRate)){
		alert('One of your submissions is not a number, please try again');
	}else{
    //Mutliply the two variables
    const newValue = calculateValue(currentMoney, transferRate);

    //Display result in third input field
    document.getElementById('newValue').value = newCurrencyType + " " + newValue;
    //Adds displayed value to array
    pushToArray(newCurrencyType + newValue, valueArray);
	}
    // Write array to page
    document.getElementById('arrayDiv').innerHTML = valueArray.toString();
    document.getElementById('arrayDiv').style.fontSize = "x-large";
});


//Reload the page when clear button hit
clearBtn.addEventListener('click', (e) => {
  location.reload();
});
!
999px

Console