article {
    display: flex;
    flex-direction: column;
}

.question {
    display: none;
}

.result {
    display: none;
}

#img {
    width: 150px;
    height: 150px;
    margin: 0 auto;
}

#startimg {
    width: 300px;
    height: 300px;
    margin: 0 auto;
}

#problemimg {
    width: 300px;
    height: 300px;
    margin: 0 auto;
}

.share {
    margin: 0 auto;
}