2 đoạn css không tương thích nhờ mọi người giúp đỡ

Mình có 2 đoạn code của 2 file css này để định dạng cho menu ngang nhưng không đồng nhất nó được.

HTML:

<div id='csscssmenu'>
<ul>
<li>
home
</li>
<ul>
<li>
Tin tuc
</li>
</ul>
</ul>

Đoạn css đầu tiên ốp vào thì được nhưng đoạn thứ 2 thì khi rê chuột qua không hiện tin tức lên: Em mới học CSS mong các bác xem giúp
CSS:

HTML:

#Menu
{
    /*background-image: url(ImagesDesign/Menu.png);*/
    background-color:Green;
    height: 41px;
    width: 100%;
}
#Menu ul
{
    color: white;
    list-style-type: none;
    padding: 0px;
    margin: 0px;
}
 
#Menu ul li
{
    width: 110px;
    display: block;
    position: relative;
    float: left;
    text-align: center;
    line-height: 42px; /*border-right: dotted 1px #84ac0b;*/
    font-size: 10pt;
    font-family: Tahoma, Arial;
    font-weight: bold;
}
 
#Menu ul li a
{
    text-decoration: none;
    color: White;
}
#Menu ul li:hover
{
    /*background-image: url(ImagesDesign/HoverMenu.png);*/
    background-color:#e2cc15;
    color: Green;
}
#Menu ul li a:hover
{
    color: Green;
}
#Menu ul ul
{
    visibility: hidden;
    position: absolute;
    top: 42px;
    left: 0px;
    background-color: Green;
    z-index: 10;
    font-size: 9pt;
}
#Menu ul li li
{
    text-align: left;
    padding-left: 10px;
    border-bottom: dotted 1px white;
    border-right-style: none;
    width: 170px;
    font-size: 10pt;
    height: 35px;
    line-height: 35px;
}
#Menu ul li li:hover
{
    background-color: #59600c;
    background-image: none;
    color: #ede61f;
}
#Menu ul li li a:hover
{
    color: #ede61f;
}
#Menu ul li:hover ul
{
    visibility: visible;
}

HTML:

#cssmenu{ height:37px; display:block; padding:0; margin:0;  border:1px solid; border-radius:5px; }
#cssmenu > ul {list-style:inside none; padding:0; margin:0;}
#cssmenu > ul > li {list-style:inside none; padding:0; margin:0; float:left; display:block; position:relative;}
#cssmenu > ul > li > a{ outline:none; display:block; position:relative; padding:12px 20px; font:bold 13px/100% Arial, Helvetica, sans-serif; text-align:center; text-decoration:none; text-shadow:1px 1px 0 rgba(0,0,0, 0.4); }
#cssmenu > ul > li:first-child > a{border-radius:5px 0 0 5px;}
#cssmenu > ul > li > a:after{ content:''; position:absolute; border-right:1px solid; top:-1px; bottom:-1px; right:-2px; z-index:99; }
#cssmenu ul li.has-sub:hover > a:after{top:0; bottom:0;}
#cssmenu > ul > li.has-sub > a:before{ content:''; position:absolute; top:18px; right:6px; border:5px solid transparent; border-top:5px solid #fff; }
#cssmenu > ul > li.has-sub:hover > a:before{top:19px;}
#cssmenu ul li.has-sub:hover > a{ background:#3f3f3f; border-color:#3f3f3f; padding-bottom:13px; padding-top:13px; top:-1px; z-index:999; }
#cssmenu ul li.has-sub:hover > ul, #cssmenu ul li.has-sub:hover > div{display:block;}
#cssmenu ul li.has-sub > a:hover{background:#3f3f3f; border-color:#3f3f3f;}
#cssmenu ul li > ul, #cssmenu ul li > div{ display:none; width:auto; position:absolute; top:38px; padding:10px 0; background:#3f3f3f; border-radius:0 0 5px 5px; z-index:999; }
#cssmenu ul li > ul{width:200px;}
#cssmenu ul li > ul li{display:block; list-style:inside none; padding:0; margin:0; position:relative;}
#cssmenu ul li > ul li a{ outline:none; display:block; position:relative; margin:0; padding:8px 20px; font:10pt Arial, Helvetica, sans-serif; color:#fff; text-decoration:none; text-shadow:1px 1px 0 rgba(0,0,0, 0.5); }
#cssmenu, #cssmenu > ul > li > ul > li a:hover{ background:#4fbdf0; background:-moz-linear-gradient(top, #4fbdf0 0%, #45b2d2 100%); background:-webkit-gradient(linear, left top, left bottom, color-stop(0%,#4fbdf0), color-stop(100%,#45b2d2)); background:-webkit-linear-gradient(top, #4fbdf0 0%,#45b2d2 100%); background:-o-linear-gradient(top,  #4fbdf0 0%,#45b2d2 100%); background:-ms-linear-gradient(top, #4fbdf0 0%,#45b2d2 100%); background:linear-gradient(top,  #4fbdf0 0%,#45b2d2 100%); filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#4fbdf0', endColorstr='#45b2d2',GradientType=0); }
#cssmenu{border-color:#3589a1;}
#cssmenu > ul > li > a{border-right:1px solid #3589a1; color:#fff;}
#cssmenu > ul > li > a:after{border-color:#6ed1ff;}
#cssmenu > ul > li > a:hover{background:#36acd2;}