body {
    height: 100%;
    width: 100%;
}
#loader-container {
    position: absolute;
    top: 0;
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    -webkit-transition: opacity 500ms linear;
    transition: opacity 500ms linear;
}
#app {
    opacity: 0;
    -webkit-transition: opacity 1000ms linear;
    transition: opacity 1000ms linear;
}