.main {
    background-color: white;
}

#introduce {
    display: flex;
    flex: auto;
}

h2 {
    font-size: 30px;
    text-align: left;
    padding-left: 50px;
}

h1 {
    font-size: 40px;
    text-align: right;
    padding-right: 100px;
    font-family: 'Noto Sans JP', sans-serif;
}

#introduce img {
    display: block;
    width: 20%;
    height: 20%;
    margin: 100px 30px 100px 70px;
    box-shadow: 20px 20px 0 #053e62;
}

main img {
    border-radius: 10px;
}

#main_title {
    font-family: 'Dela Gothic One', cursive;
    margin-right: auto;
    margin-left: auto;
    padding-top: 50px;
}

#introduce {
    text-indent: 1em;
    font-size: 2rem;
    margin-left: auto;
    margin-right: auto;
}

#introduce_pic {
    display: flex;
    flex: auto;
    padding: 30px;
}

#introduce h3 {
    text-align: center;
    padding-top: 100px;
    padding-right: 100px;
    padding-left: 100px;
    padding-bottom: 100px;
    font-size: 20px;
    line-height: 50px;
    font-family: monospace;
    font-weight: 600;
    text-indent: 1em;
    line-height: 2.5rem;
}

.ope_title {
    border-left: 10px solid #053e62;
    padding: 15px;
    font-family: 'Noto Sans JP', sans-serif;
    margin-left: 50px;
    margin-top: 50px;
    font-size: 40px;
}

@media (max-width: 767px) {
    .main {
        max-width: 100%;
    }
    #introduce_img {
        margin: 0 0 0 0;
    }
}