https://jingyan.baidu.com/article/09ea3ede0f1ae2c0afde397e.html
input::-webkit-input-placeholder, textarea::-webkit-input-placeholder {
color: #666;
}
input:-moz-placeholder, textarea:-moz-placeholder {
color:#666;
}
input::-moz-placeholder, textarea::-moz-placeholder {
color:#666;
}
input:-ms-input-placeholder, textarea:-ms-input-placeholder {
color:#666;
}