.pc {
    display: block;
}

.phone {
    display: none;
}

@media screen and (max-width: 700px) {
    .pc {
        display: none !important;
    }

    .phone {
        display: block !important;
    }

    .navbar {
        background-color: #fff;
    }

    .index_business .business_title {
        font-size: 35px;
    }

    .business_desc,
    .index_company_intr .company_intr_desc {
        font-size: 18px;
    }

    .copyright {
        font-size: 12px;
    }

    .faq1 {
        font-size: 50px;
    }

    .faq2 {
        font-size: 50px;
        left: 25%;
    }

    .faq3 {
        font-size: 50px;
    }

    .nav-item:hover ul {
        display: none;
    }
}