.app-preloader-mask {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 20000;
    background-color: #ececec;
    display: flex;
    align-items: center;
    align-content: center;
}

.app-preloader-mask img {
	margin: auto;
}