.jy{
    background-color: rgba(0, 0, 0, 0.2); border-radius: 10px;padding: 20px; color: #fff;font-size: 18px;
}


.imgbox {
    height: calc(100vh);
    width: 100%;
    overflow: hidden;
    background-image: url(/webdir/web4/tu/tu1.jpg);
    background-size: cover;
    display: flex;
    align-items: center;
}



.tu1_txt {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;   
    display: flex;
      align-items: center; 
    z-index: 3;
}


.tu1_txt2 {
    position: absolute;
    left: 0;
    top: 0;
    width: 50%;
    height: 100%;
   background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 3;
}



.tu1 {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    outline: none;
    border: none;
    overflow: hidden;
}

.tu1 img {
    width: 100%;
    height: calc(100vh);
    object-fit: cover;
    object-position: center top;
    outline: none;
    border: none;overflow: hidden;    
}

.btn-bai-outline {
    color: #fff;
    background-color: transparent;
    background-image: none;
    border-color: #fff;
}
 
.pt-50{padding-top: 50px;}
.pt-70{padding-top: 70px;}
.pb-70{padding-bottom: 70px;}
.mt-70,.mt-70a{ margin-top: 70px;;}
.mb-70{ margin-bottom: 70px;}

.jiacu{
    font-weight: bold;
}

.f-70{font-size: 70px;}
.f-40{font-size: 40px;}
.f-50{font-size: 50px;}

.mt-40a{ margin-top: 40px;}
@media (max-width:767px){

    .imgbox {
        padding-top: 20px;
        ;
        height: 100%;
        width: 100%;
        overflow: auto;
        ;
        background-image: url(/webdir/web5/tu/tu1.jpg);
        background-size: cover;
        display: block;
        align-items: center;
        padding-bottom: 20px;
        ;
    }


    .f-40{font-size: 30px;}
    .f-70{font-size: 40px;}
    .f-50{font-size: 26px;}
    .mt-40a{ margin-top: 10px;}
    .mt-70a{ margin-top: 50px;;}
    .pt-70{padding-top: 50px;}
    .pb-70{padding-bottom: 50px;}
}