html {
    height: 100%;
}

body {
    margin: 0;
    min-height: 100%;
    background-color: #ffffff;
    background-size: 100% 100%;
}

.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

.loading {
    width: 40px;
    display: block;
    margin: 0 auto;
}