Background image isn't showing at div class

hi all,

I am working on android project with ionic framework.
I have www\templates\home.html in which I am using images for item icon.

my view code home.html

  <div class="row gray">
     <div class="col"><div class="abc"></div>
     Opening Balance</div>

my css in style.css:

     background: url('../img/icon.png');

Anyone have any suggestions?
Thanks in advance