%bg-image {
    width: 100%;
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
}

.image-one {
    @extend %bg-image;
    background-image:url(/img/image-one.jpg");
}

.image-two {
    @extend %bg-image;
    background-image:url(/img/image-two.jpg");
}