asp.net TextBox文本框背景透明+浅色背景文字提示

.usre_name{ width:240px; height:38px; line-height:38px; border:1px solid #dfe1e8; background:url(login_img_03.png)  no-repeat left center; padding-left:30px; }
.usre_name input{ width:230px; height:36px; border:1px solid #fff;color:#666;}
.password{ width:240px; height:38px; line-height:38px; border:1px solid #dfe1e8; background:url(login_img_09.png)  no-repeat left center; padding-left:30px; }
.password input{ width:230px; height:36px; border:1px solid #fff;color:#666;}
 
 
 
 
aspx:
 
<div class="usre_name">
<span style="float: left; background-color:white; color:rgba(0, 0, 0, 0.08)">请输入用户名或手机号码</span>
<div style="float: left; position:absolute;">
<asp:TextBox ID="txtLoginName" runat="server" TabIndex="1" Text="15976936327" ></asp:TextBox>
</div>
</div>
 
 
cs:
protected void Page_Load(object sender, EventArgs e)
{
//文本框透明背景
txtLoginName.BackColor = System.Drawing.Color.Transparent;
}