.sub-promotion {
    position: relative;
    width: 100%;
    height: 500rem;
    display: flex;
    justify-content: center;
    background-color: #000;
    background-position: center;
    background-size: cover;
    overflow: hidden;
}
.sub-promotion::before {
    content: '';
    position: absolute;
    top: 0;
    width: 100%;
    height: 120rem;
    background: linear-gradient(to bottom, #0000004f 0%, transparent 100%);
    z-index: 1;
}

.sub-promotion-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.sub-p-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 20rem;
    text-align: center;
    margin-top: 40rem;
}

.sub-p-text h5 {
    color: #fff;
    font-size: 50rem;
    font-weight: 600;
}

.p-route {
    color: #fff;
    display: flex;
    align-items: center;
    gap: 5px;
}

.p-route p {
    font-size: 17rem;
}

.sub-navigation {
    position: absolute;
    bottom: 0; left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, .3);
    z-index: 20;
}

.sub-navBtn {
    color: #fff;
    font-size: 18rem;
    padding: 18rem 40rem;
    white-space: nowrap;
}

.sub-navBtn.show {
    color: #222 !important;
    font-weight: 700;
    background-color: #fff !important;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, .08);
}

.sub-navBtn:hover {
    background-color: rgba(0, 0, 0, .2);
}


.about {
    background: url(../images/about-bg.jpg);
    background-position: center;
    background-size: cover;
}
.business {
    background: url(../images/business-bg.jpg);
    background-position: center;
    background-size: cover;
}
.product {
    background: url(../images/product-bg.jpg);
    background-position: center;
    background-size: cover;
}
.partners {
    background: url(../images/partners-bg.jpg);
    background-position: center;
    background-size: cover;
}
.contact {
    background: url(../images/contact-bg.jpg);
    background-position: center;
    background-size: cover;
}


/*==================================================*/
@media (max-width: 550px) {
    .sub-p-text h5 {
        font-size: 60rem;
    }
    
    .p-route p {
        font-size: 22rem;
    }
    
    .sub-navBtn {
        font-size: 22rem;
    }
}