#main_about .introduce h3 {
    font-size: 20px;
    line-height: 2.5rem;
}

@media (max-width: 767px) {
    h1.ope_mogi {
        max-width: 100%;
        text-align: left;
        margin-left: 10px;
        font-size: 20px
    }
    #main_about .introduce h3 {
        max-width: 100%;
        padding: 0 0 0 0;
        line-height: 25px;
        font-size: 13px;
        padding: 0 10px 0 10px;
        margin-top: 30px;
    }
    #main_about .introduce_pic {
        display: none;
    }
    #main_about .sp_introduce_pic {
        display: flex;
        flex-wrap: wrap;
        margin: 40px;
        max-width: 100%;
    }
}