.custom-grid-posts {
    display: flex;
    flex-wrap: wrap;
    margin: -15px;
}

.custom-grid-posts-item {
    flex-basis: calc(33.33% - 30px);
    margin: 15px;
    padding: 15px;
    background-color: #f7f7f7;
    border: 1px solid #ddd;
}

.custom-grid-posts-title {
    margin: 0 0 15px;
}

.custom-grid-posts-excerpt {
    margin-bottom: 15px;
}

.custom-grid-posts-read-more {
    display: inline-block;
    padding: 5px 10px;
    background-color: #0073aa;
    color: #fff;
    text-decoration: none;
}