SASS Background image and gradient mixin

example.html

<div class="Discussions"></div>

gadient_mixin.scss

$SIF_Red: #9e1d3a;
$SIF_LtRed: lighten($SIF_Red, 10%);
$SIF_DkRed: darken($SIF_Red, 20%);

@mixin icon($url){ 
	@include background(url($url), linear-gradient($SIF_Red, $SIF_DkRed));
	background-size: 50%, 100%;
	background-repeat: no-repeat, repeat;
	background-position: center, left;
	}
	
.Discussions {
	height:50px;
	width:50px;
	@include icon('YOUR_URL_HERE');
}