.main-banner {
    position: relative;
    display: inline-block;
    width: 100%;
    height: 340px;
    text-align: center;
}

.vision {
    background: #888888 url('../../images/banner_vision.jpg') no-repeat;
    background-size: cover;
}

.news-events {
    background: #888888 url('../../images/banner_news.jpg') no-repeat;
    background-size: cover;
}

.investor {
    background: #888888 url('../../images/banner_investor.jpg') no-repeat;
    background-size: cover;
}

.human-resource {
    background: #888888 url('../../images/banner_hr.jpg') no-repeat;
    background-size: cover;
}

.product-security {
    background: #888888 url('../../images/banner_product_security.jpg') no-repeat;
    background-size: cover;
}

.product-safety {
    background: #888888 url('../../images/banner_product_safety.jpg') no-repeat;
    background-size: cover;
}

.product-convenience {
    background: #888888 url('../../images/banner_product_convenience.jpg') no-repeat;
    background-size: cover;
}

.product-energy {
    background: #888888 url('../../images/banner_product_energy.jpg') no-repeat;
    background-size: cover;
}

.product-moto {
    background: #888888 url('../../images/banner_product_moto.jpg') no-repeat;
    background-size: cover;
}

.index-banner-text h3 {
    display: block;
    margin: 0 auto;
    font-family: 'Roboto', sans-serif;
    font-size: 50px;
    font-weight: 100;
    color: #ffffff;
    line-height: 1;
    letter-spacing: 1px;
}

    .index-banner-text h3 label {
        display: inline-block;
        font-family: "Helvetica Neue", Helvetica, Arial, STHeiti, "Microsoft JhengHei", 微軟正黑體, sans-serif;
        color: #ffffff;
        letter-spacing: 6px;
        font-size: 42px;
        margin: 0 5px 0 0;
    }

.index-banner-text p {
    display: block;
    margin: 10px auto 0 auto;
    text-transform: uppercase;
    color: #929292;
    font-size: 16px;
    font-family: "Open Sans",Helvetica,Arial,sans-serif;
    letter-spacing: 1px;
}

.main-banner.human-resource .index-banner-text p, .main-banner.news-events .index-banner-text p {
    letter-spacing: 4px;
}

.index-banner-text p span {
    position: relative;
    top: 0;
    margin: 0 20px;
    font-size: 20px;
    text-transform: none;
}

@media screen and (max-width: 700px) {
    .index-banner-text h3 label, .index-banner-text h3 {
        font-size: calc( 2.3rem + 2.5vw - 8px );
    }

    .main-banner.human-resource .index-banner-text p, .main-banner.news-events .index-banner-text p {
        letter-spacing: 2px;
    }
}

@media screen and (max-width: 480px) {
    .main-banner {
        height: 140px;
    }

    .vision {
        background: #888888 url('../../images/banner_vision_phone.jpg') no-repeat;
    }

    .news-events {
        background: #888888 url('../../images/banner_news_phone.jpg') no-repeat;
    }

    .investor {
        background: #888888 url('../../images/banner_investor_phone.jpg') no-repeat;
    }

    .human-resource {
        background: #888888 url('../../images/banner_hr_phone.jpg') no-repeat;
    }

    .product-security {
        background: #888888 url('../../images/banner_product_security_phone.jpg') no-repeat;
    }

    .product-safety {
        background: #888888 url('../../images/banner_product_safety_phone.jpg') no-repeat;
    }

    .product-convenience {
        background: #888888 url('../../images/banner_product_convenience_phone.jpg') no-repeat;
    }

    .product-energy {
        background: #888888 url('../../images/banner_product_energy_phone.jpg') no-repeat;
    }

    .product-moto {
        background: #888888 url('../../images/banner_product_moto_phone.jpg') no-repeat;
    }

    .index-banner-text h3 label, .index-banner-text h3 {
        font-size: calc( 1.3rem + 2.5vw - 8px );
    }

        .index-banner-text h3 label {
            letter-spacing: 2px;
        }

    .index-banner-text p span, .index-banner-text p {
        font-size: calc( 0.6rem + 2.5vw - 8px );
    }

        .index-banner-text p span {
            margin: 0 7px;
        }
}