.container {
    position: relative;
    margin: auto;
    width: 60%;
    height: 100%;
    border-style: solid;
    border-color:blueviolet ;
    text-align: center;
}

.tile {
    position:absolute;
    width: 30%;
    height: 30%;
    background-size: 100% 100%;
    border: 2px solid royalblue;
}

img {
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    transition: transform 5s;
}

.goBtn {
    position: absolute;
    width: 100px;
    height: 50px;
    bottom: 5%;
    left: 15%;
}
.choose {
    position: absolute;
    bottom: 2%;
    left: 45%;
    width:50px;
    height: 100px;
    display: none;    
}
.tile1 {
    top: 15%;
    left: 15%;
    background-color: seashell;
}
.tile2 {
    top: 15%;
    right: 15%;
    background-color: seashell;
}
.tile3 {
    bottom: 15%;
    left: 15%;
    background-color: seashell;
}
.tile4 {
    bottom: 15%;
    right: 15%;
    background-color: seashell;
}

@keyframes flipIt {
    from{
        transform: rotateY(0deg);
    }
    to{
        transform: rotateY(180deg);
    }
   }