.about_qualificabox {
    width: 100%;
    position: relative;
}
.about_qualificabox>img{
    display: block;
    width: 100%;
}
@media (max-width: 1600px) and (min-width: 1300px){
    .about_qualificabox {
        height: 400px;
        overflow: hidden;
    }
    .about_qualificabox>img{
        width: auto;
        height: 100%;
    }
}
@media (max-width: 1299px){
    .about_qualificabox {
        height: 400px;
        overflow: hidden;
    }
    .about_qualificabox>img{
        width: auto;
        height: 100%;
    }
}