Необходимо с использованием sass задать значение градиента элементу

@include background-image(linear-gradient(white 0, yellow 50%, transparent 50%));

background-image: -webkit-gradient(linear ,,color-stop(50%,#ff0),color-stop(50%,transparent));
background-image: -webkit-linear-gradient(yellow 50%,transparent 50%);
background-image: linear-gradient(to ,#ff0 50%,transparent 50%);

background-image: -webkit-gradient(linear ,,color-stop(50%,#ff0),color-stop(50%,transparent));

background-image: linear-gradient(to ,#ff0 50%,transparent 50%);

@mixin linearGradient($top, $bottom){
    background: $top; /* Old browsers */
    background: -moz-linear-gradient(top,  $top 0%, $bottom 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,$top), color-stop(100%,$bottom)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  $top 0%,$bottom 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  $top 0%,$bottom 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  $top 0%,$bottom 100%); /* IE10+ */
    background: linear-gradient(to bottom,  $top 0%,$bottom 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#000000',GradientType=0 ); /* IE6-9 */
}