body {
    font-family: Raleway,sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #636b6f;
    margin-top: -10px;
}
.footer_propio {
    position: absolute;
    left: 0px;
    bottom: -30px;
    width: 100%;
    font-size:10px;
    color:#636b6f;
    padding: 3px;
    text-align: center;
}

*{margin: 0; padding: 0;}
.caja{
    display: flex;
    flex-flow: column wrap;
    justify-content: center;
    align-items: center;
    background: #333944;
}
.box{
    width: 450px;
    height: 300px;
    background: #CCC;
    overflow: hidden;
}

.box img{
    width: 100%;
    height: auto;
}
@supports(object-fit: cover){
    .box img{
        height: 100%;
        object-fit: cover;
        object-position: center center;
    }
}