#loading-bg {
    position: fixed;
    display: block;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    text-align: center;
    background-color: #f8f8f8;
    z-index: 99;
}

#loading-calendar {
    position: absolute;
    display: block;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    text-align: center;
    background-color: #f8f8f8;
    z-index: 99;
}
body {
    margin: 0; height: 100%; overflow: hidden;
}

.loading-logo {
    position: absolute;
    left: calc(50% - 45px);
    top: 40%;
}
.loading-logo img{
    width: 100px;
    height: 100px;
}