JAlert正在显示没有背景颜色

Question

我已将JAlert插件添加到我的asp.net MVC Web应用程序中，并且我已经包含了必要的CSS，图像和脚本。

但问题是警报显示时没有背景颜色，如下所示： -

CSS文件是： -

/**
* jAlert v.1.0.0
* Copyright (c) 2008 Julian Castaneda
* http://www.smooka.com/blog/
* Requires: jQuery 1.2+
*/

body{
    margin:0px;
    padding:0px;
}

.msg-box-cont{
    color:#000000;  
    z-index:1014; 
    position: absolute;
    padding:0px;
    margin:0px;
    display:none;
    top:0px;
}
.msg-box-cont table {
    margin:5px;
    padding:0px;
    border:0px;
}

.msg-box-cont a{
    color:#000;
}

.msg-btn{
    width:15px;
    height:15px;
    cursor:pointer;
    position:relative;
    padding:0px;
    margin:0px;
    top:-4px;
    background:url(images/msg-close-sprite.gif) no-repeat;
}
.msg-text{
    font-size:12px;
    margin-left:4px;
    margin-right:4px;
}

.msg-icon{
    height:16px;
    width:16px;
    float:left;
    top:3px;
    margin:0px 8px 0px 2px;
    background:url(images/msg-icon-sprite.png) no-repeat;
}

.err_msg_cont{
    width:100%;
    padding:5px;
    color:#000000;
    margin-left:20px;
}


.msg-icon-success{background-position:0px 0px;}
.msg-icon-warning{background-position:0px -16px;}
.msg-icon-fatal{background-position:0px -32px;}
.msg-icon-info{background-position:0px -48px;}

.msg-success{
    border:1px solid #009900;
    background-color:#C6FFA4;
}
.msg-success a:hover{
    color:#006600;
}

.msg-warning{
    border:1px solid #FFCC00;
    background-color:#FFFF99;
}
.msg-warning a:hover{
    color:#FF3300;
}

.msg-fatal{
    border:1px solid #DD0000;
    background-color:#FFB7B7;
}
.msg-fatal a:hover{
    color:#660000;
}

.msg-info{
    border:1px solid #0159BA;
    background-color:#CAD3FF;
}
.msg-info a:hover{
    color:#003366;
}

.close-success{background-position:0px 0px;}
.close-success:hover{background-position:-15px 0px;}

.close-warning{background-position:0px -15px;}
.close-warning:hover{background-position:-15px -15px;}

.close-fatal{background-position:0px -30px;}
.close-fatal:hover{background-position:-15px -30px;}

.close-info{background-position:0px -45px;}
.close-info:hover{background-position:-15px -45px;}