*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
.splash-screen{
    width: 100%;
    height: 100%;
    background-color: #eee;
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}
.splash-screen span{
    position: absolute;
    color: white;
    font-size: 14px;
    font-weight: bold;
    background-color: red;
    padding: 5px;
    border-radius: 6px;
    text-align: center;  
    cursor: pointer; 
} 
.info-game{
    display: flex;
    width: 980px;
    height: 60px;
    border: 1px solid cornflowerblue;
    margin: 5px  auto;
    justify-content:space-between;
    align-items: center;
    padding: 10px;
}
.content-game{
    display: flex;
    flex-wrap: wrap;
    width: 802px;
    margin: 50px  auto;
}
.content-game .box{
    height: 150px;
    position: relative;
    transition: .5s;
    transform-style: preserve-3d;
    cursor: pointer;
    flex: 0 0 192px;
    margin: 0 4px 8px;
}
.content-game .box .back{
    background-color: #607D8b;
    transform: rotateY(180deg);
}
 .content-game .box .back img{
    width: 181px;
    height: 140px;

} 
.content-game .box .front{
    background-color: #333;
    line-height: 150px;
}
 .content-game .box .front::before{
content: "!";
color: white;
font-weight: bold;
font-size: 90px;
}
.content-game .box .face{
    width: 100%;
    height: 100%;
    border: 5px solid #2196f3;
    position: absolute;
    text-align: center;
    backface-visibility: hidden;
} 
.content-game .box.is-flipped, .content-game .box.has-match{
    -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  transform: rotateY(180deg);
  pointer-events: none;
}
.content-game.no-clickng{
    pointer-events: none;
}