Css：在鼠標上移動的導航

Question

我在下面創建了一個css導航，如何防止這種情況發生在鼠標懸停上？

我已經包含的圖標以及

這裏是低於

#nav { height: 25px; 
    padding: 22px 0 2px 53px; 
    font-weight: bold; 
    border-top: 1px #5B92B7 solid; 
    margin-bottom: 20px; 
           background: #477da9; /* Old browsers */ 
           background: -moz-linear-gradient(top, #477da9 0%, #2c6c9a 25%, #245e8e 50%, #1a5385 75%, #023667 100%); /* FF3.6+ */ 
           background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#477da9), color-stop(25%,#2c6c9a), color-stop(50%,#245e8e), color-stop(75%,#1a5385), color-stop(100%,#023667)); /* Chrome,Safari4+ */ 
           background: -webkit-linear-gradient(top, #477da9 0%,#2c6c9a 25%,#245e8e 50%,#1a5385 75%,#023667 100%); /* Chrome10+,Safari5.1+ */ 
           background: -o-linear-gradient(top, #477da9 0%,#2c6c9a 25%,#245e8e 50%,#1a5385 75%,#023667 100%); /* Opera 11.10+ */ 
           background: -ms-linear-gradient(top, #477da9 0%,#2c6c9a 25%,#245e8e 50%,#1a5385 75%,#023667 100%); /* IE10+ */ 
           background: linear-gradient(top, #477da9 0%,#2c6c9a 25%,#245e8e 50%,#1a5385 75%,#023667 100%); /* W3C */ 
           filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#477da9', endColorstr='#023667',GradientType=0); /* IE6-9 */ z-index: 1; 

     margin-left:0;  
      margin-top: -17px; 
      font-size:12px 
} 

#nav li { 
    list-style: none; 
    display: inline; 
    margin: 0px; 
    padding: 0 0 26px 0; 

} 

#nav li a { 
    font-family: Arial; 
    font-style:normal; 
    text-decoration: none; 
    color: #789AB8; 

padding: 0 10px 2px 36px; 
    background: url("../img/icon_nav_system.png") no-repeat scroll 17px -13px transparent; 

} 

#nav li a:hover { 

color: #fff; 
font-weight: bold; 
} 

#nav li:hover { 
    background: url("../img/icon_nav_system.png") no-repeat scroll 17px 1px transparent; 
    margin: 0; 
    color: #fff; 
    padding: 1px; 
} 


.on a:link, .on a:visited,.on a:hover 
{ 

color: #fff;  
font-weight:bold; 
} 

#nav li.on a { 
    color: #fff;  
} 
#nav li.on { 

    margin: 0; 
    background: url("../img/icon_nav_system.png") no-repeat scroll 17px 1px transparent; 
    padding: 1px; 
} 

HTML

<div class="nav-b" > 
       <ul id="nav"> 
        <li class="on"><a href="#" class="express"> Link 1</a></li> 
        <li><a href="#" class="link2">Link 2</a></li> 
        <li><a href="#" class="link3"> Link 3</a></li> 
       </ul> 
      </div> 

Answer 1

我的代碼從這個類#nav li:hover繼承人刪除padding:1px;演示http://jsfiddle.net/kevinPHPkevin/Qe2Fm/