.classiniz::before{
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
 background: -moz-linear-gradient(left,rgba(134,19,138,.9) 0,rgba(0,0,0,0) 100%);
background: -webkit-linear-gradient(left,rgba(134,19,138,.9) 0,rgba(0,0,0,0) 100%);
 background: linear-gradient(to right,rgba(134,19,138,.9) 0,rgba(0,0,0,0) 100%);
    z-index: 0;
}