Ember serve thinks "/" is a division in shorthand background property

I have below code in my scss file.

.logo { background: url('../images/logo-web.svg') no-repeat -15px -453px / 235px 630px transparent; }

when ember compile scss compiler thinks it's a division and do the calculation. This happens when I use ember serve only. Due to that issue syntax for the background is going to be wrong.

And this is what browser reads.

background: url("../images/logo-web.svg") no-repeat -15px -1.92766 630px transparent;

Please help me to solve this issue, Thanx!!!