.listing{
    display: block; font-size: 0;
    text-align: center;
    margin: 0 -0.625rem;
}
.listing .listing_item{
    display: inline-block; width: 100%;
    padding: .625rem; font-size: 1rem;
}

.listing .listing_item .listing_image{
    display: block; margin-bottom: 1.25rem;
    padding-bottom: 56.25%;
}
.listing .listing_item .listing_image img{
    display: inline-block; 
}


@media screen and (min-width:40em){
    .listing{
        margin: 0 -0.9375rem;
    }
    .listing .listing_item{
        width: 50%; vertical-align: top;
        padding: .9375rem;
    }
    .listing .listing_item .listing_image{
        margin-bottom: 1.875rem;
    }
}


@media screen and (min-width:64em){
    .listing{ margin: 0 -0.9375rem; }
    .listing .listing_item{ width: 33.333%;  }
    .listing .listing_item .listing_inner{
        margin: 0;
    }
}