.loading {
    background: url("loading.gif") no-repeat center;
    width: 300px;
    height: 300px;
}
.loading-container {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.3);
    z-index: 1000;
}
.dn {
    display: none;
}
.hvc-flex {
    display: flex;
    align-items: center;
    justify-content: center;
}