.admin-mega-form-container {
    overflow: hidden;
    clear: both;
    margin: 0 0 15px 0;
    padding: 5px 15px;
    border: 1px solid #ddd;
}

.admin-mega-form-author-select {
    float: left;
    width: 20%;
}

.admin-mega-form-poems-select {
    float: left;
    width: 80%;
    max-height: 150px;
    overflow: auto;
}