@media screen and (max-width: 768px) {
    .item-img{
        width: 100%;
        height: auto;
        margin: 40px auto;
        text-align: center;
    }
    .item-img img{
        width: 100%;
        height: auto;
    }
    .item-text{
        width: 92%;
        margin: 0 auto 30px;
        font-size: 16px;
        line-height: 1.5;
    }
}
@media screen and (min-width: 768px) and (max-width: 1200px) {

    .item-img{
        width: 90%;
        height: auto;
        margin: 40px auto;
        text-align: center;
    }
    .item-img img{
        width: 100%;
        height: auto;
    }
    .item-text{
        width: 700px;
        margin: 0 auto 30px;
        font-size: 18px;
        line-height: 1.5;
    }
}
@media screen and (min-width: 1200px) {

    .item-img{
        width: 100%;
        height: auto;
        margin: 40px 0;
        text-align: center;
    }
    .item-img img{
        width: 1000px;
        height: auto;
    }
    .item-text{
        width: 700px;
        margin: 0 auto 30px;
        font-size: 18px;
        line-height: 1.5;
    }
}