html css问题 ，网页ul，li的内容紧贴在一起，如何才能实现如图的效果？

问题遇到的现象和发生背景

html css发现网页出现没有空行

img

问题相关代码，请勿粘贴截图

css代码和html代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>操作题1</title>
<link href="css/test1.css" rel="stylesheet" type="text/css" />
</head>

<body>
    <div class="left_bottom">
        <div class="yuanjiaotop">
            <div class="mainyuanjiao_left"></div>
            <div class="mainyuanjiao_right"></div>
            <div class="mainyuanjiao_center">品牌出版社</div>
            <div class="clear"></div>
        </div>
        <div class="yuanjiaobottom">
            <ul>
                <li><a href="#">贵州人民出版社</a></li>
                <li><a href="#">清华大学出版社</a></li>
                <li><a href="#">机械工业出版社</a></li>
                <li><a href="#">电子工业出版社</a></li>
                <li><a href="#">浙江大学出版社</a></li>
                <li><a href="#">邮电出版社</a></li>
                <li><a href="#">上海文艺出版社</a></li>
            </ul>
        </div>
    </div>
</body>
</html>

.left_bottom{
    width:150px;
}
.mainyuanjiao_left{
    background-image: url(../images/index-bg-left.gif);
    background-position: left top;
    background-repeat: no-repeat;
    float: left;
    height: 21px;
    width: 6px;
}
.mainyuanjiao_right{
    background-image: url(../images/index-bg-right.gif);
    background-position: left top;
    height: 21px;
    width: 6px;
    float: right;
    background-repeat: no-repeat;    
}
.mainyuanjiao_center{
    background-image: url(../images/index-bg-center.gif);
    height: 21px;
    line-height: 21px;
    width: 128px;
    background-repeat: repeat-x;
    background-position: left top;
    float: left;
    font-size: 12px;
    color: white;
    padding-left: 10px;    
}
.yuanjiaobottom{
    border-bottom: 1px #853200 solid;
    border-left: 1px #853200 solid;
    border-right: 1px #853200 solid;
}
.yuanjiaobottom ul li{
    font-size: 12px;
    height: 30px;
    line-height: 30px;
}
.yuanjiaobottom ul li a{
    color: #333333;
    text-decoration: none;
}
.yuanjiaobottom ul li a:hover{
    color: mediumaquamarine;
    text-decoration: underline;
}
.yuanjiaobottom ul{
    padding-left: 20px;
}
运行结果及报错内容
我的解答思路和尝试过的方法
我想要达到的结果

如何实现如图效果

img

li加个oveflow:hidden


*{margin: 0;padding: 0}
    .left_bottom{
    width:150px;
}
.mainyuanjiao_left{
    background-image: url(../images/index-bg-left.gif);
    background-position: left top;
    background-repeat: no-repeat;
    float: left;
    height: 21px;
    width: 6px;
}
.mainyuanjiao_right{
    background-image: url(../images/index-bg-right.gif);
    background-position: left top;
    height: 21px;
    width: 6px;
    float: right;
    background-repeat: no-repeat;    
}
.mainyuanjiao_center{
    background-image: url(../images/index-bg-center.gif);
    height: 21px;
    line-height: 21px;
    width: 128px;
    background-repeat: repeat-x;
    background-position: left top;
    float: left;
    font-size: 12px;
    color: white;
    padding-left: 10px;    
}
.yuanjiaobottom{
    border-bottom: 1px #853200 solid;
    border-left: 1px #853200 solid;
    border-right: 1px #853200 solid;
}
.yuanjiaobottom ul li{
    width: 100%;
    font-size: 12px;
    height: 30px;
    line-height: 30px;
    overflow: hidden;
}
.yuanjiaobottom ul li a{
    color: #333333;
    text-decoration: none;
}
.yuanjiaobottom ul li a:hover{
    color: mediumaquamarine;
    text-decoration: underline;
}
.yuanjiaobottom ul{
    margin-left: 20px;
    list-style-position: inside
}