.conteiner-principal 
.conteiner {
    padding: 10px 20px;
    padding-top: 10px;
    padding-right: 20px;
    padding-bottom: 0px;
    padding-left: 20px;
}
::placeholder { /* Chrome, Firefox, Opera, Safari 10.1+ */
    color: red;
    opacity: 1; /* Firefox */
}