.vi-mb-md {
    margin-bottom: 60px;
}
@media screen and (max-width: 960px) {
    .vi-mb-md {
        margin-bottom: 30px;
    }
}

.vi-mb-sm {
    margin-bottom: 30px;
}
@media screen and (max-width: 960px) {
    .vi-mb-sm {
        margin-bottom: 15px;
    }
}