Try it Live

​x
 
<!DOCTYPE html> 
<html> 
 <head> 
  <style>
  .border-width { 
     border: 3px solid aqua;
     width:300px;
     background-color: pink;
  } 
  </style> 
 </head> 
 <body>
  <div class="border-width">
  <p>This div has a border width of 3px in aqua color</p>
  </div>  
 </body> 
</html>
​