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CSS

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HTML 

            
              <div class="container">
  
  <form id="theform" action="javascript:void(0);">
    
    <label for="about-yourself">About yourself:</label>
    <div class="ta-container">
      <textarea id="about-yourself" class="ta" name="about-yourself" rows="6" cols="75" data-maxchars="20" data-over="false" placeholder="Enter text here..." required></textarea>
      <div class="status-bar">
        <table>
          <tr><td>Characters:</td><td class="charcount"></td></tr>
          <tr><td class="remaining-label">Remaining:</td><td class="remaining"></td></tr>
        </table>
      </div>
    </div>
    
    <label for="your-proposal">Your proposal:</label>
    <div class="ta-container">
      <textarea id="your-proposal" class="ta" name="your-proposal" rows="6" cols="75" data-maxchars="25" data-over="false" placeholder="Enter text here..." required></textarea>
      <div class="status-bar">
        <table>
          <tr><td>Characters:</td><td class="charcount"></td></tr>
          <tr><td class="remaining-label">Remaining:</td><td class="remaining"></td></tr>
        </table>
      </div>
    </div>
    
    <label for="supporting-info">Supporting information:</label>
    <div class="ta-container">
      <textarea id="supporting-info" class="ta" name="supporting-info" rows="6" cols="75" data-maxchars="40" data-over="false" placeholder="Enter text here..." required></textarea>
      <div class="status-bar">
        <table>
          <tr><td>Characters:</td><td class="charcount"></td></tr>
          <tr><td class="remaining-label">Remaining:</td><td class="remaining"></td></tr>
        </table>
      </div>
    </div>
    
    <input id="submitbtn" type="submit" value="Submit">
    
  </form>
  
</div>
!

CSS 

            
              /* Import Google Font */
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans);

/* RESET */
* {
  padding: 0;
  margin: 0;
  font-size: 1em;
  box-sizing: border-box;
  font-family: 'Nunito Sans';
  color: hsl(0, 0%, 50%);
}

/* Containing areas */
.container { 
  width: 600px; 
  margin: 1em auto;
}
.ta-container {
  width: 100%;
  border: 1px solid hsl(0, 0%, 70%);
  border-radius: 0.25em;
  margin: 0.25em 0 1.5em;
}
.hasfocus {
  box-shadow: 0px 0px 6px hsl(210, 50%, 60%);
}

/* The textarea itself */
textarea { 
  padding: 0.25em;
  width: 100%;
  max-width: 100%;
  border: none;
  vertical-align:bottom;
  color: hsl(0, 0%, 50%);
  border-radius: 0.25em;
  outline: none;
}

/* The status bar */ 
.status-bar { 
  background: hsl(0, 0%, 90%);
  padding: 0.25em;
  text-align: right;
  font-family: sans-serif;
  font-size: 0.7em;
  width: 100%;
  color: hsl(0, 0%, 50%);
  border-radius: 0 0 0.25em 0.25em;
}
table { 
  width: auto;
  margin-left: auto;
  line-height: 1em;
}
.charcount, .remaining { 
  font-weight: bold;
}
.over {
  color: hsl(0, 80%, 60%);
}
/* The submit button */
#submitbtn {
  padding: 0.4em 1.2em;
  background: hsl(0, 0%, 100%);
  border: 1px solid hsl(0, 0%, 60%);
  color: hsl(0, 0%, 50%);
  border-radius: 0.25em;
}
#submitbtn:enabled:hover {
	background: hsl(0, 0%, 90%);
}
#submitbtn:enabled:active {
  background: hsl(0, 0%, 30%);
  color: hsl(0, 0%, 90%)
}
#submitbtn:disabled { 
  border: 1px solid hsl(0, 0%, 90%);
  color: hsl(0, 0%, 90%);
}
!

JS 

            
              /**
 * Functions to add/remove class on div.ta-container to emulate focus removed from textarea by CSS line 37 (outline:none)
 */
function setFocus(ta_container) {
  
  ta_container.classList.add('hasfocus')
  
}
function removeFocus(ta_container) {
  
  ta_container.classList.remove('hasfocus')
  
}

/**
 * Function to enable or disable #submitbtn
 * #submitbtn will be disabled if any of the textareas have data-over set 
 * to true due to exceeding the value specified in data-maxchars
 */
function setSubmitBtn() {
  
  var tas = theform.querySelectorAll('.ta')
  var disabled = false
  tas.forEach(function(ta) {
    
    if (ta.getAttribute('data-over') == 'true') {
      disabled = true
    }
    
  })
    
  if (disabled) {
    theform.querySelector('#submitbtn').disabled = true
  } else {
    theform.querySelector('#submitbtn').disabled = false
  }
  
}

/**
 * Function to count the characters in .ta and update .ta_container.statusbar
 * @param  {Obj} ta_container - the .ta-container element
 * @param  {Obj} ta - the .ta textarea element
 * @param  {Integer} maxLength - the max number of characters allowed in the .ta textarea element
 */
function countChars(ta_container, ta, maxLength) {
  
  var numChars = ta.value.length
  
  ta_container.querySelector('.charcount').innerHTML = numChars + '/' + maxLength
  ta_container.querySelector('.remaining').innerHTML = Math.abs( maxLength - numChars )
  
  if ( numChars > maxLength ) {
    
    ta_container.querySelector('.remaining-label').classList.add( 'over' )
    ta_container.querySelector('.remaining-label').innerHTML = 'Over by:'
    ta_container.querySelector('.remaining').classList.add( 'over' )
    ta.style.color = 'hsl(0, 80%, 60%)'
    ta.setAttribute('data-over', 'true')
    setSubmitBtn()
    
  } else {
    
    ta_container.querySelector('.remaining-label').classList.remove( 'over' )
    ta_container.querySelector('.remaining-label').innerHTML = 'Remaining:'
    ta_container.querySelector('.remaining').classList.remove( 'over' )
    ta.style.color = 'hsl(0, 0%, 50%)'
    ta.setAttribute('data-over', 'false')
    setSubmitBtn()
    
  }
  
}

/**
 * Initialisation function
 */
function initialise() {
  
  var ta_containers = theform.querySelectorAll('.ta-container')
  
  ta_containers.forEach( function(ta_container) {
    
    var ta = ta_container.querySelector('.ta')
    var maxLength = ta.getAttribute('data-maxchars')
    var numChars = ta.value.length
    
    ta_container.querySelector('.charcount').innerHTML = numChars + '/' + maxLength
    ta_container.querySelector('.remaining').innerHTML = maxLength - numChars
    
    ta.addEventListener( 'input', function() {
      countChars(ta_container, ta, maxLength)
    })
    
    ta.addEventListener( 'focus', function(){
      setFocus(ta_container)
    })
    
    ta.addEventListener( 'blur',  function(){
      removeFocus(ta_container)
    })
    
  })
  
}

/* Let's go! */
initialise()
!
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