.certificates {
    margin: 35px 0 20px;
}

.certificate {
    margin-bottom: 25px;
    text-align: center;
}

.certificate img {
    -webkit-box-shadow: 0 0 10px 0 rgba(10, 10, 10, 0.2);
    -moz-box-shadow:    0 0 10px 0 rgba(10, 10, 10, 0.2);
    box-shadow:         0 0 10px 0 rgba(10, 10, 10, 0.2);
}

@media (min-width: 992px) and (max-width: 1199px) {
    .certificate  img {
        width: 200px;
        height: auto;
    }
}

@media (max-width: 767px) {
    .certificate img {
        max-width: 100%;
    }
}