Yes, you can use the shadow spread property of the box-shadow rule:
.myDiv
{
border: 1px solid #333;
width: 100px;
height: 100px;
box-shadow: 10px 0 5px -2px #888;
}
<div class="myDiv"></div>
The fourth property there -2px
is the shadow spread, you can use it to change the spread of the shadow, making it appear that the shadow is on one side only.
This also uses the shadow positioning rules 10px
sends it to the right (horizontal offset) and 0px
keeps it under the element (vertical offset.)
5px
is the blur radius 🙂