Web Text Editor using highlight.js

index.html

<h1 class="wte-title">Web Text Editor</h1>


<div class="wrapper">
<div class="edit-window">
  <div class="window-border">
    <span class="close"></span>
    <span class="minimize"></span>
    <span class="maximize"></span>
    <select class="language">
			  <option selected>JavaScript</option>
			  <option>HTML</option>
			  <option>CSS</option>
			</select>
  </div>
  <div class="input-area">
    <textarea class="textarea"id="input" autofocus></textarea>
    <textarea id="cousor" class="cousor"></textarea>
    <pre>
<code id="output" class="preview javascript">
</code>
    </pre>
  </div>
</div>
</div>

script.js

//  Element
var inputarea = document.getElementById("input");
var outputarea = document.getElementById("output");
var cousor = document.getElementById("cousor");


output.addEventListener("click", function (event) {
  inputarea.style.zIndex = 4;
  inputarea.style.color = "black";
}, false);

inputarea.addEventListener("input", function (event) {
  outputarea.innerHTML = inputarea.value;
  inputarea.style.zIndex = 4;
  //
  refreshHighlighting();
}, false);


// Refresh highlighting when blured focus from textarea.
inputarea.addEventListener("blur", function (event) {
  refreshHighlighting();
}, false)


function refreshHighlighting() {
  hljs.highlightBlock(outputarea);
  //setTimeout("refreshHighlighting()", 1000);
  inputarea.style.zIndex = 0;
  inputarea.style.color = "transparent";
}
refreshHighlighting();

style.scss

@import url('https://fonts.googleapis.com/css?family=Source+Code+Pro');
@import url('https://fonts.googleapis.com/css?family=Comfortaa');



.wte-title {
  color: #fff;
  text-align: center;
  font-family: 'Comfortaa', cursive;
  font-size: 3rem;
}


.wrapper {
  position:  absolute;
  margin: auto;
  left: 0;
  right: 0;
}


$edit-window-height: 400px;
body {
  background: #EC87C0;
  left: 0;
  right: 0;
}

.edit-window {
  width: 800px;
  height:$edit-window-height;
  background: #fafbfc;
  border-radius: 5px;
  box-shadow: 0px 3px 15px rgba(0,0,0,0.2);
}

.window-border {
  display: flex;
  top: 0;
  height: 50px;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  background: #E6E9ED;
  
  .language {
    position: relative;
    top: 10px;
    right: -655px;
    -webkit-appearance: none;
    appearance: none;
    background: none;
    outline: none;
    text-align:  center;
    height: 30px;
    border: none;
  }
  .close, .minimize,  .maximize {
    top: 17px;
    left: 10px;
  }
  .close {
    position: relative;
    width: 15px;
    height: 15px;
    border-radius: 28px;
    background: #ED5565;
  }
  
  .minimize {
    position: relative;
    margin-left: 8px;
    width: 15px;
    height: 15px;
    border-radius: 28px;
    background: #FFCE54;
  }
  
  .maximize {
    position: relative;
    margin-left: 8px;
    width: 15px;
    height: 15px;
    border-radius: 28px;
    background: #48CFAD;
  }
}


.input-area {
  position: relative;
  outline: none;
}

.preview {
  position: absolute;
  display: inline-block;
  background: transparent;
  padding: 0;
  bottom: 0;
  top: 0;
  width: 100%;
  height: $edit-window-height;
  z-index: 3;
}

.textarea {
  position: absolute;
  display: inline-block;
  padding: 0;
  width: 100%;
  height: $edit-window-height;
  z-index: 3;
  // Reset
  margin: 0;
	padding: 0;
	background: none;
	border: none;
	border-radius: 0;
	outline: none;
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}


.cousor {
  position: absolute;
  display: inline-block;
  padding: 0;
  width: 100%;
  height: $edit-window-height;
  z-index: 1;
  // Reset
  margin: 0;
	padding: 0;
	background: none;
	border: none;
	border-radius: 0;
	outline: none;
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}

.preview, .textarea, cousor {
  font-size: 17px;
  font-weight: 200;
  font-family: 'Source Code Pro', monospace;
}

.pointer {
  color: #333;
}