修改input，textarea 标签 placeholder的颜色 和光标

input,
textarea {
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0); //去除手机端点击的背景色
    caret-color: #EE2B32;//光标
}
input::-webkit-input-placeholder,textarea::-webkit-input-placeholder {
    color: #999999;
    font-weight: 500;
}
textarea:-moz-placeholder,input:-moz-placeholder {
    color: #999999;
    font-weight: 500;
}

textarea::-moz-placeholder,input::-moz-placeholder {
    color: #999999;
    font-weight: 500;
}

textarea:-ms-input-placeholder,input:-ms-input-placeholder {
    color: #999999;
    font-weight: 500;
}