.post_item img {
    width: 90%;
    height: 90%;
}

.post_item video {
    width: 90%;
    height: 90%;
}

.post_item {
    text-align: center;
}

#posts {
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}