.but {
    width: 80%;
}
table {
    margin-left: 10%;
    margin-right: auto;
    width: 90%;
}
#row1, #row2, #row3 {
    width: 33%;
    display:inline-block;
    vertical-align: top;
    margin-top: 39px;
}
#row1_div, #row2_div, #row3_div {
    width: 95%;
}
.post_zag, .card-text, .card-body, .post_zag, .author {
    width: 90%;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}
.post {
    background-color: #7fc3ff;
    border-radius: 50px;
    width: 90%;
    height: 95%;
    margin-bottom: 20px;
}
details {
    color: #ffffff;
}
#add_post {
    margin-top: 20px;
    margin-left: 83%;
}
.hz1 {
    margin: 5%;
    font-size: 160%;
}