修改placeholder的样式

.pmtdValue::-webkit-input-placeholder {
color: #bfbfbf;
font-size: .8em;
}

.pmtdValue:-moz-placeholder {
color: #bfbfbf;
font-size: .8em;
}

.pmtdValue::-moz-placeholder {
color: #bfbfbf;
font-size: .8em;
}

.pmtdValue:-ms-input-placeholder {
color: #bfbfbf;
font-size: .8em;
}