style.
    .img-center {
        margin: 15px 15px 0;
        width: 50px;
        height: 50px;
    }
    .text-center {
        text-align: center;
        font-size: 16px;
    }

div
    img.img-center(src="/image/loading.gif")
    p.text-center {{vm.modalOptions.title}}