.img-red-blck, .img-red-blck img { 
padding: 0; margin: 0; 
-moz-border-radius: 15px; border-radius: 15px; 
}
 
.img-red-blck { margin: 25px auto; position: relative; text-align: center; }
.img-red-blck img { border: 2px solid #c92626; }

.img-red-blck:after {
    position: absolute;
    top: -5%;
    left: -4%;
    width: 81%;
    height: 80%;
    background: #c92626;
    border: 2px #c92626 solid;
    content: '';
    z-index: -1;
    -moz-border-radius: 15px;
    border-radius: 15px;
    margin: 0 0 0 0;
}

@media screen and (max-width: 1000px) { 
.img-red-blck { max-width: 80%; width: fit-content; }
}