.article, .book {
    border:1px solid #aabbee;
    padding:16px;
    margin:4px 0;
}

.article-title, .book-title {
    font-weight:bold;
    line-height:1.5rem;
    text-align:justify;
    margin:0 0 8px 0;
}

.article-info, .book-info {
    font-size:90%;
    text-align:justify;
    margin:4px 0;
}

.history {
    margin:8px 0;
}

.history-date {
    display:inline-block;
    width:160px;
    line-height:1.5rem;
    @media screen and (max-width:419px) {
        display:block;
    }
}

.history-contents {
    display:inline-block;
    line-height:1.5rem;
    @media screen and (max-width:419px) {
        display:block;
    }
}