.html:

    <div id="wrapper">
    	<div class="scrollbar" id="style-1">
      	   <div class="force-overflow"></div>
    	</div>
    </div>



.scss:

.scrollbar
{
	margin-left: 30px;
	float: left;
	height: 300px;
	width: 65px;
	background: #F5F5F5;
	overflow-y: scroll;
	margin-bottom: 25px;
}


.force-overflow
{
	min-height: 450px;
}


#wrapper
{
	text-align: center;
	width: 500px;
	margin: auto;
}

#style-1::-webkit-scrollbar-track
{
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
	border-radius: 3px;
	background-color: #F5F5F5;
}

#style-1::-webkit-scrollbar
{
	width: 12px;
	background-color: #F5F5F5;
}

#style-1::-webkit-scrollbar-thumb
{
	border-radius: 10px;
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
	background-color: #555;
}

Styling scroll bar

Styled Scroll Bar

SASS