.inputFile {
    width: 170px;
    height:22px;
    position: relative;
    overflow: hidden;
	background-color:#FFF;
}
.inputFile span {
    display: block;
    position: absolute;
}
.inputFile input {
    position: absolute;
    right: 0;
    z-index: 2;
    font-size: 100px; /* Aumenta tamanho do campo */
    opacity: 0;
    filter: alpha(opacity=0);
}