.overlay{
    height: 100%;
    width: 100%;
}
.overlay img{
    width: 200px;
    cursor: pointer;
}
.flex-container {
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: row;
    -ms-flex-direction: row;
    flex-direction: row;
    -webkit-flex-wrap: nowrap;
    -ms-flex-wrap: nowrap;
    flex-wrap: nowrap;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-align-content: flex-start;
    -ms-flex-line-pack: start;
    align-content: flex-start;
    -webkit-align-items: flex-start;
    -ms-flex-align: start;
    align-items: flex-start;
}
.flex-item{
    -webkit-order: 0;
    -ms-flex-order: 0;
    order: 0;
    -webkit-flex: 0 1 auto;
    -ms-flex: 0 1 auto;
    flex: 0 1 auto;
    -webkit-align-self: center;
    -ms-flex-item-align: center;
    align-self: center;
}