.admin_page table {
    border: 1px solid #000000;
}

.admin_page th {
    background-color: #c2c2c2;
}

.admin_page th td {
    border: 1px solid #000000;
}

.article_title .product_name {
    width: 200px;
}

.admin_page table {
    border: 1px solid #000000;
}

.admin_page th {
    background-color: #c2c2c2;
}

.admin_page th, .admin_page td {
    border: 1px solid #000000;
}

.article_title, .product_name {
    width: 200px;
}

Fix error in CSS where cell borders are not displayed
Fix error in CSS where cell borders are not displayed
