.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.grid-container {
    display: grid;
    grid-template-columns: 50% 50%;
    grid-template-rows: auto auto;
    gap: 20px 20px 20x 0px;
    background-color: #ffffff;
    text-align: center;
    padding: 10px 10px 10px 10px;
}

.main_block {
    width: 100%;
    border: 0px black solid;
}

.main_block::before, .main_block::after {
    overflow: hidden;
    content: "";
    display: table;
}

.main_block::after {
    clear: both;
}

.inner_block {
    float: left;
    width: 50%;
}

.inner_block img {
    width: 95%;
    height: auto;
    vertical-align: middle;
    padding: 10px;
}

.publication_block {
    width: 100%;
    border: 2px black solid;
}

.publication_block::before, .publication_block::after {
    overflow: hidden;
    content: "";
    display: table;
}

.publication_block::after {
    clear: both;
}