@media print and (color){
* {
      -webkit-print-color-adjust: exact;
      print-color-adjust: exact;
   }

    #printables {
        background-color: black;
        height: 100%;
        width: 100%;
        position: fixed;
        top: 0;
        left: 0;
        margin: 0;
        padding: 15px;
        font-size: 14px;
        line-height: 18px;
    }
    #certificate_container table th td{
        border: 1px solid black;
        border-collapse: collapse;
    }

}