Just use background: "YourColor" instead of background-color: "YourColor"

Full Example:

.dataTables_wrapper .dataTables_paginate a.paginate_button:hover {
    background: #e4dbfb !important;
    color: #1f1f1f !important; 
    border: 1px solid #c2aef5 !important;
}

Cheers. (Up Vote To Save Souls)