Problem to Linkbutton

Hi,
Using these
       

.lb_log{
            background-image: url("../pict/Key_16x16.png");
            background-repeat: no-repeat;
            padding-left: 15px;
            text-decoration: none;
            top: 30px;
            left: 1145px;
            width: 60px;
            height: 30px;
            font-size:large;
            font-weight:bold;
        }    
		...
                            <asp:LinkButton ID="lb_user_acc" 
                                Text = "登录"
                               CssClass="lb_log" 
                               Font-Names="Arial Unicode MS" 
                               Font-Bold="true"
                               Font-Size="10pt" 
                               ForeColor="#5637D4"
                               OnClick="lb_log_Click" 
                               runat="server"/>
							   ...

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the word is displayed like

while I want the word be displayed horizontally. what to adjust?