.bg-image {
    position: relative;
    overflow: hidden;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}

.vh-100 {
    height: 100vh !important;
}

.mask {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-attachment: fixed;
}