.pm-table-container {
    max-height: 520px;
    overflow: auto;
    border: 1px solid #ddd;
    padding: 5px;
	background: #fff;
}

#pm-placeholders-table tr:nth-child(even) {
    background: #f9f9f9;
}

#pm-placeholders-table td:first-child input[type="text"] {
    width: 300px;
}

#pm-placeholders-table td:nth-child(2) input[type="text"] {
    width: 450px;
}