Error style border only show 1 line in css?

[aJuinkpieneade88]

I have a sample code in demo here\[code\]<div id="theContainer"> <div id="item">Content 1</div> <div id="item">Content 2</div></div>?\[/code\]And javascript\[code\]document.getElementById('item').style.borderTop = '1px solid #0ea2c7';?\[/code\]Error borderTop only show 1 line, how to show in line all item ?