How to set a border for an HTML div tag

Question

I am trying to create a border around a div tag in HTML. In few browsers, the border does not appear.

Here is my HTML code:

<div id="divActivites" name="divActivites" style="border:thin">
    <textarea id="inActivities" name="inActivities" style="border:solid">
    </textarea> 
</div> 

How do I set a border for an HTML div tag?

Answer 1

 you can use

border-width:2px;
border-style:solid;
border-color:black;

or as shorthand

border: 2px solid black