.hidden{display:none;}
.show{display: block;}
.error {
    color: red;
    line-height: 1.0;
}
.errors {
    border-style: solid;
    border-color: red;
}

/*.errorBox {*/
    /*border:2px solid red !important;*/
/*}*/

@keyframes blink {
    50% { border-color: #ff0000; }
}
.errorBox
{ /*or other element you want*/
    animation: blink .5s step-end infinite alternate;
}