body{
    background-image: url(../img_correct/background.black.png);
    background-repeat: no-repeat;
    background-size: 100vw;
    color: white;
    font-family: "游ゴシック体", YuGothic, "游ゴシック", "Yu Gothic", sans-serif;
    font-size:13px;
}

.correct{
    width:50vw;
    position: absolute;
    top:12vw;
    left:25vw;
}

.answer{
    width:80vw;
    position: absolute;
    top:37vw;
    left:10vw;
}

.back{
    width:30vw;
    position: absolute;
    top:153vw;
    left:35vw;
}