.outer{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-direction:column;
    -webkit-box-orient:vertical;
    box-orient:vertical;
    -webkit-flex-direction:column;
    flex-direction:column;
}
.opacity{
    -webkit-animation: opacity 0.3s linear;
    animation: opacity 0.3s linear;
}
@-webkit-keyframes opacity {
    0% {
        opacity:0;
    }
    100% {
        opacity:1;
    }
}
@keyframes opacity {
    0% {
        opacity:0;
    }
    100% {
        opacity:1;
    }
}