我正在修改W3Layouts。模板上的下拉菜单经过多次修改后仍然无法正常工作。我已经工作了几个小时，我似乎无法让孩子菜单下拉。感谢您提供的帮助。对于我在格式化这个问题时所犯的任何错误，我深表歉意。
<!--start header-->
<div class="h_bg">
<div class="wrap">
<div class="wrapper">
<div class="header">
<div class="logo">
<a href="index.html"><img class="hideOnMobile" src="images/logoHRCC_275x275px.png" alt="" /> </a>
<a href="index.html"><img class="hideOnDesktop mobileStyle" src="images/logoHRCC_275x275px.png" alt="" /> </a>
</div>
<div class="spacer"></div>
<div class="cssmenu">
<ul>
<li class="active"><a href="index.html"><span>Home</span></a></li>
<li><a href="garage.html"><span>Garage</span></a></li>
<li class="has-sub"><a href="join.html"><span>Connect</span></a>
<ul>
<li><a href="eventCalendar.html"><span>Event Calendar</span></a>
<ul>
<li><a href="service.html"><span>Sub Item 1</span></a></li>
<li class="last"><a href="service.html"><span>Sub Item 2</span></a></li>
</ul>
</li>
<li><a href="join.html"><span>Membership</span></a>
<ul>
<li><a href="service.html"><span>Sub Item 1</span></a></li>
<li class="last"><a href="service.html"><span>Sub Item 2</span></a></li>
</ul>
<li><a href="join.html"><span>Vendor Registration</span></a>
<li><a href="join.html"><span>Venue Sponsorship</span></a>
<li><a href="join.html"><span>Show Registration</span></a>
</li>
</ul>
</li>
<li><a href="eventCalendar.html"><span>Calendar</span></a></li>
<li class="last"><a href="contact.html"><span>Contact</span></a></li>
</ul>
</div>
<div class="clear"> </div>
</div>
</div>
</div>
</div>
.cssmenu {
position: absolute;
bottom: 0;
right: 0;
float: right;
}
.cssmenu > ul > li {
display:inline-block;
position: relative;
background: #f6f6f6; /* Old browsers */
background: -moz-linear-gradient(top, #f6f6f6 1%, #f0f0f0 19%, #efefef 39%, #ededed 59%, #dddddd 98%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#f6f6f6), color-stop(19%,#f0f0f0), color-stop(39%,#efefef), color-stop(59%,#ededed), color-stop(98%,#dddddd)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #f6f6f6 1%,#f0f0f0 19%,#efefef 39%,#ededed 59%,#dddddd 98%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #f6f6f6 1%,#f0f0f0 19%,#efefef 39%,#ededed 59%,#dddddd 98%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #f6f6f6 1%,#f0f0f0 19%,#efefef 39%,#ededed 59%,#dddddd 98%); /* IE10+ */
background: linear-gradient(to bottom, #f6f6f6 1%,#f0f0f0 19%,#efefef 39%,#ededed 59%,#dddddd 98%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f6f6f6', endColorstr='#dddddd',GradientType=0 ); /* IE6-9 */
}
.cssmenu > ul > li.active a{
color: #ffffff;
background: #9d9d9d; /* Old browsers */
background: -moz-linear-gradient(top, #9d9d9d 5%, #8d8d8d 40%, #7d7d7d 68%, #6d6d6d 82%, #5d5d5d 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(5%,#9d9d9d), color-stop(40%,#8d8d8d), color-stop(68%,#7d7d7d), color-stop(82%,#6d6d6d), color-stop(100%,#5d5d5d)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* IE10+ */
background: linear-gradient(to bottom, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#9d9d9d', endColorstr='#5d5d5d',GradientType=0 ); /* IE6-9 */
}
.cssmenu > ul > li span img {
vertical-align: middle;
}
.cssmenu > ul > li > a {
display: block;
font-family: 'Julius Sans One', sans-serif;
font-size: 1em;
color: #161616;
line-height: 3.8em;
padding: 14px 24px;
-webkit-transition: color .15s;
-moz-transition: color .15s;
-o-transition: color .15s;
transition: color .15s;
}
.cssmenu > ul > li > a:hover {
-webkit-transition: 0.9s;
-moz-transition: 0.9s;
-o-transition: 0.9s;
transition: 0.9s;
color: #ffffff;
background: #9d9d9d; /* Old browsers */
background: -moz-linear-gradient(top, #9d9d9d 5%, #8d8d8d 40%, #7d7d7d 68%, #6d6d6d 82%, #5d5d5d 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(5%,#9d9d9d), color-stop(40%,#8d8d8d), color-stop(68%,#7d7d7d), color-stop(82%,#6d6d6d), color-stop(100%,#5d5d5d)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* IE10+ */
background: linear-gradient(to bottom, #9d9d9d 5%,#8d8d8d 40%,#7d7d7d 68%,#6d6d6d 82%,#5d5d5d 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#9d9d9d', endColorstr='#5d5d5d',GradientType=0 ); /* IE6-9 */
}
.cssmenu > ul > li > ul {
font-family: 'Julius Sans One', sans-serif;
z-index: 999;
opacity: 0;
visibility: hidden;
padding: 8px;
background: #5C5C5C;
color:#fff;
text-align: left;
position: absolute;
top: 55px;
left: 50%;
margin-top: 34px;
margin-left: -90px;
width: 180px;
-webkit-transition: all .3s .1s;
-moz-transition: all .3s .1s;
-o-transition: all .3s .1s;
transition: all .3s .1s;
}
.cssmenu > ul > li:hover > ul {
display: block;
opacity: 1;
top: 65px;
visibility: visible;
}
.cssmenu > ul > li > ul:before {
content: '';
display: block;
border-color: transparent transparent #5C5C5C transparent;
border-style: solid;
border-width: 10px;
position: absolute;
top: -20px;
left: 50%;
margin-left: -10px;
}
.cssmenu > ul ul > li {
position: relative;
}
.cssmenu ul ul a {
color: #ffffff;
font-family: 'Julius Sans One', sans-serif;
font-size: 13px;
background: #5C5C5C;
padding: 8px;
display: block;
-webkit-transition: background-color 0.1s;
-moz-transition: background-color 0.1s;
-o-transition: background-color 0.1s;
transition: background-color 0.1s;
}
.cssmenu ul ul a:hover {
background-color: #f0f0f0;
}
.cssmenu ul ul ul {
visibility: hidden;
opacity: 0;
position: absolute;
top: -16px;
left: 206px;
padding: 8px;
background-color: #fafafa;
text-align: left;
width: 160px;
-webkit-transition: all .3s;
-moz-transition: all .3s;
-o-transition: all .3s;
transition: all .3s;
}
.cssmenu ul ul > li:hover > ul {
opacity: 1;
left: 190px;
visibility: visible;
}
.cssmenu ul ul a:hover {
background: #4F4E4E;
color: #f0f0f0;
}