.div-flex.double {
    display: block;
}

.div-flex.double .content-block {
    margin: auto auto 25px auto !important;
}

.post-list .content-block.post-item{
    width: calc(100% / 3 * 2 - 15px);
    flex-basis: calc(100% / 3 * 2 - 15px);
    max-width: calc(100% / 3 * 2 - 15px);
}