.bt-formnewsletter.pesquisa .form-control {
    color: #000;
    border-bottom: 1px solid #000;
}


.bt-formnewsletter.pesquisa .form-control::-webkit-input-placeholder { /* Chrome/Opera/Safari */
    color: rgba(0,0,0,0.5);
}
.bt-formnewsletter.pesquisa .form-control::-moz-placeholder { /* Firefox 19+ */
    color: rgba(0,0,0,0.5);
}
.bt-formnewsletter.pesquisa .form-control:-ms-input-placeholder { /* IE 10+ */
    color: rgba(0,0,0,0.5);
}
.bt-formnewsletter.pesquisa .form-control:-moz-placeholder { /* Firefox 18- */
    color: rgba(0,0,0,0.5);
}