CSS for：悬停仅适用于某些元素

Question

我们有一个旨在允许用户优化存档中内容的导航。因此，他们可以在菜单中选择一年，然后扩展以从子菜单中选择一个月并相应地过滤结果。它在大多数情况下效果很好，但悬停时生效的样式似乎只适用于每个子菜单的上半部分。对于最高的一年，它在1月 - 10月工作，第二年工作于1月 - 9月，并且每增加一个子菜单都会损失一个月。似乎没有任何理由。有什么想法吗？

CSS：

nav { 
font-family: Helvetica, Arial, "Lucida Grande", sans-serif; 
line-height: 1.5; 
/*margin: 50px auto;*/ 
position: absolute; 
right: 40px; 
width: 200px; 
-webkit-box-shadow: 2px 2px 5px rgba(0,0,0,0.2); 
-moz-box-shadow: 2px 2px 5px rgba(0,0,0,0.2); 
box-shadow: 2px 2px 5px rgba(0,0,0,0.2); 
} 

.menu-item { 
background: #fff; 
width: 200px; 
} 

.menu-item h4 a { 
    color: white; 
    display: block; 
    text-decoration: none; 
    width: 200px; 
} 

.menu-item h4 { 
    border-bottom: 1px solid rgba(0,0,0,0.3); 
    border-top: 1px solid rgba(255,255,255,0.2); 
    color: #fff; 
    font-size: 15px; 
    font-weight: 500; 
    padding: 7px 12px; 
    /*Gradient*/ 
    background: #a90329; /* Old browsers */ 
    background: -moz-linear-gradient(top, #a90329 0%, #8f0222 44%, #6d0019 100%); /*          FF3.6 */ 
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#a90329), color-stop(44%,#8f0222), color-stop(100%,#6d0019)); /* Chrome,Safari4 */ 
    background: -webkit-linear-gradient(top, #a90329 0%,#8f0222 44%,#6d0019 100%); /* Chrome10,Safari5.1 */ 
    background: -o-linear-gradient(top, #a90329 0%,#8f0222 44%,#6d0019 100%); /* Opera 11.10 */ 
    background: -ms-linear-gradient(top, #a90329 0%,#8f0222 44%,#6d0019 100%); /* IE10 */ 
    background: linear-gradient(top, #a90329 0%,#8f0222 44%,#6d0019 100%); /* W3C */ 
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a90329', endColorstr='#6d0019',GradientType=0); /* IE6-9 */ 
} 

    .menu-item h4:hover { 
     background: #cc002c; /* Old browsers */ 
     background: -moz-linear-gradient(top, #cc002c 0%, #6d0019 100%); /* FF3.6 */ 
     background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#cc002c), color-stop(100%,#6d0019)); /* Chrome,Safari4 */ 
     background: -webkit-linear-gradient(top, #cc002c 0%,#6d0019 100%); /* Chrome10,Safari5.1 */ 
     background: -o-linear-gradient(top, #cc002c 0%,#6d0019 100%); /* Opera 11.10 */ 
     background: -ms-linear-gradient(top, #cc002c 0%,#6d0019 100%); /* IE10 */ 
     background: linear-gradient(top, #cc002c 0%,#6d0019 100%); /* W3C */ 
     filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#cc002c', endColorstr='#6d0019',GradientType=0); /* IE6-9 */ 
    } 

    .alpha p { 
font-size: 13px; 
padding: 8px 12px; 
color: #aaa; 
} 

.menu-item ul { 
background: #fff; 
font-size: 13px; 
line-height: 30px; 
list-style-type: none; 
overflow: hidden; 
padding: 0px; 
} 

.menu-item ul a { 
    margin-left: 20px; 
    text-decoration: none; 
    color: #aaa; 
    display: block; 
    width: 200px; 
} 

/*li Styles*/ 
.menu-item li { 
border-bottom: 1px solid #eee; 
} 

.menu-item li:hover { 
    background: #eee; 
} 

.menu-item ul { 
background: #fff; 
font-size: 13px; 
line-height: 30px; 
height: 0px; /*Collapses the menu*/ 
list-style-type: none; 
overflow: hidden; 
padding: 0px; 
} 

.menu-item ul { 
background: #fff; 
font-size: 13px; 
line-height: 30px; 
height: 0px; 
list-style-type: none; 
overflow: hidden; 
padding: 0px; 
/*Animation*/ 
-webkit-transition: height 1s ease; 
-moz-transition: height 1s ease; 
-o-transition: height 1s ease; 
-ms-transition: height 1s ease; 
transition: height 1s ease; 
} 

.menu-item:hover ul { 
height: 372px; 
/*#endregion */ 
} 

HTML：

<nav> 
     <h2>View posts from: </h2> 
     <div class="menu-item alpha"> 
      <h4><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year">@DateTime.Now.Year</a></h4> 
      <ul> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=1">January</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=2">February</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=3">March</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=4">April</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=5">May</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=6">June</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=7">July</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=8">August</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=9">September</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=10">October</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=11">November</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.Year&filterMonth=12">December</a></li> 
      </ul> 
     </div> 

     <div class="menu-item"> 
      <h4><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year">@DateTime.Now.AddYears(-1).Year</a></h4> 
      <ul> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=1">January</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=2">February</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=3">March</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=4">April</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=5">May</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=6">June</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=7">July</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=8">August</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=9">September</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=10">October</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=11">November</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-1).Year&filterMonth=12">December</a></li> 
      </ul> 
     </div> 

     <div class="menu-item"> 
      <h4><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year">@DateTime.Now.AddYears(-2).Year</a></h4> 
      <ul> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=1">January</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=2">February</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=3">March</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=4">April</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=5">May</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=6">June</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=7">July</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=8">August</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=9">September</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=10">October</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=11">November</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-2).Year&filterMonth=12">December</a></li> 
      </ul> 
     </div> 

     <div class="menu-item"> 
      <h4><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year">@DateTime.Now.AddYears(-3).Year</a></h4> 
      <ul> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=1">January</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=2">February</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=3">March</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=4">April</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=5">May</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=6">June</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=7">July</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=8">August</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=9">September</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=10">October</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=11">November</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-3).Year&filterMonth=12">December</a></li> 
      </ul> 
     </div> 

     <div class="menu-item"> 
      <h4><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year">@DateTime.Now.AddYears(-4).Year</a></h4> 
      <ul> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=1">January</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=2">February</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=3">March</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=4">April</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=5">May</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=6">June</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=7">July</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=8">August</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=9">September</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=10">October</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=11">November</a></li> 
       <li><a href="JeffreysArchive.cshtml?filterYear=@DateTime.Now.AddYears(-4).Year&filterMonth=12">December</a></li> 
      </ul> 
     </div> 

    </nav> 

Answer 1

JSFiddle

JSFIDDLE 

我不能在这里看不出什么问题，它工作正常，在此的jsfiddle。 div块之间可能有重叠，z-index可能是您的临时解决方案。