我的导航栏崩溃正在崩溃但是当我不在上面徘徊时

Question

我正在为一份工作制作登陆页面并设置导航栏然后我发现我必须将导航栏固定到顶部，在我修复它之后第二个栏的折叠只是出现当我不甚至悬停在上面。必须为下一项添加更多边距才能工作 "propertly" 但有点难看

.fixed-top {
    position: fixed;
    right: 0;
    left: 0;
    z-index: 1030;
    top: 0;
    border-width: 0 0 1px;
}

#nav ul li a {
    display: block;
    padding: 7px 15px;
    text-decoration: none;
    font-weight: bold;
    color: #FFFFFF;
}

#nav li a:hover {
    color: #000000;
    background-color: #fff; 
}

#nav .navbar-izquierda ul {
    width: 100%;
    float: left;
    margin: auto;
    padding: 0;
    list-style: none;
    background-color: #434343;
    box-shadow: 10px 0 10px #000000;
    border-bottom: 1px solid #000000;
}


.clearfix:after {
    display:block;
    clear:both;
}

.menu-wrap {
    width:100%;
    box-shadow:0px 1px 3px rgba(0,0,0,0.2);
    background:#3e3436;
}

.menu {
    width: auto;
    margin:0px auto;
}

.menu li {
    margin:0px;
    list-style:none;
}

.menu a {
    transition:all linear 0.15s;
    color:#919191;
}

.menu li:hover > a, .menu .current-item > a {
    text-decoration:none;
    color:#be5b70;
}

.menu .arrow {
    font-size:11px;
    line-height:0%;
}

.menu > ul > li {
    float:left;
    display:inline-block;
    position:relative;
    font-size:14px;
}

.menu > ul > li > a {
    padding:10px 40px;
    display:inline-block;
    text-shadow:0px 1px 0px rgba(0,0,0,0.4);
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
    background:#2e2728;
}

/*----- DropDown Navbar Inferior -----*/
.menu li:hover .sub-menu {
    z-index:1;
    opacity:1;
}

.sub-menu {
    width:100%;
    padding:5px 0px;
    position:absolute;
    top:100%;
    left:0px;
    z-index:-1;
    opacity:0;
    transition: opacity linear 0.15s;
    box-shadow:0px 2px 3px rgba(0,0,0,0.2);
    background:#2e2728;
}

.sub-menu li {
    display:block;
    font-size:16px;
}

.sub-menu li a {
    padding:10px 30px;
    display:inline-block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
    background:#3e3436;
}

<div class="navbar-izquierda menu-wrap">
<nav class="menu">
    <ul class="clearfix">
        <li class="active"><a href="#">Portatil</a></li>
        <li><a href="#">Desk</a></li>
        <li><a href="#">Workstation</a></li>
        <li><a href="#">Promotions</a></li>
        <li><a href="#">Services and Guarantees <span class="arrow">&#9660;</span></a>
        <ul class="sub-menu">
            <li><a href="#">Error 1</a></li>
            <li><a href="#">Error 2</a></li>
            <li><a href="#">Horror 3</a></li>
        </ul>
        </li>        
    </ul>
</nav><!-- Navegador inferior -->
</div><!-- Navegador Inferior -->

Answer 1

关键是在开始时将下拉列表设置为visility:hidden;，在:hover状态下设置为visility:visible;。

.fixed-top {
    position: fixed;
    right: 0;
    left: 0;
    z-index: 1030;
    top: 0;
    border-width: 0 0 1px;
}

#nav ul li a {
    display: block;
    padding: 7px 15px;
    text-decoration: none;
    font-weight: bold;
    color: #FFFFFF;
}

#nav li a:hover {
    color: #000000;
    background-color: #fff; 
}

#nav .navbar-izquierda ul {
    width: 100%;
    float: left;
    margin: auto;
    padding: 0;
    list-style: none;
    background-color: #434343;
    box-shadow: 10px 0 10px #000000;
    border-bottom: 1px solid #000000;
}


.clearfix:after {
    display:block;
    clear:both;
}

.menu-wrap {
    width:100%;
    box-shadow:0px 1px 3px rgba(0,0,0,0.2);
    background:#3e3436;
}

.menu {
    width: auto;
    margin:0px auto;
}

.menu li {
    margin:0px;
    list-style:none;
}

.menu a {
    transition:all linear 0.15s;
    color:#919191;
}

.menu li:hover > a, .menu .current-item > a {
    text-decoration:none;
    color:#be5b70;
}

.menu .arrow {
    font-size:11px;
    line-height:0%;
}

.menu > ul > li {
    float:left;
    display:inline-block;
    position:relative;
    font-size:14px;
}

.menu > ul > li > a {
    padding:10px 40px;
    display:inline-block;
    text-shadow:0px 1px 0px rgba(0,0,0,0.4);
}

.menu > ul > li:hover > a, .menu > ul > .current-item > a {
    background:#2e2728;
}

/*----- DropDown Navbar Inferior -----*/
.menu li:hover .sub-menu {
    z-index:1;
    opacity:1;
    visibility:visible;
}

.sub-menu {
    width:100%;
    padding:5px 0px;
    position:absolute;
    top:100%;
    left:0px;
    z-index:-1;
    opacity:0;
    transition: opacity linear 0.15s;
    box-shadow:0px 2px 3px rgba(0,0,0,0.2);
    background:#2e2728;
    visibility:hidden;
}

.sub-menu li {
    display:block;
    font-size:16px;
}

.sub-menu li a {
    padding:10px 30px;
    display:inline-block;
}

.sub-menu li a:hover, .sub-menu .current-item a {
    background:#3e3436;
}

<div class="navbar-izquierda menu-wrap">
<nav class="menu">
    <ul class="clearfix">
        <li class="active"><a href="#">Portatil</a></li>
        <li><a href="#">Desk</a></li>
        <li><a href="#">Workstation</a></li>
        <li><a href="#">Promotions</a></li>
        <li><a href="#">Services and Guarantees <span class="arrow">&#9660;</span></a>
        <ul class="sub-menu">
            <li><a href="#">Error 1</a></li>
            <li><a href="#">Error 2</a></li>
            <li><a href="#">Horror 3</a></li>
        </ul>
        </li>        
    </ul>
</nav><!-- Navegador inferior -->
</div><!-- Navegador Inferior -->

我的导航栏崩溃正在崩溃但是当我不在上面徘徊时

My navbar collapse is collapsing but when im not hovering on it

html

css

collapse

navbar