html - CSS 不显示背景（溢出：自动没有帮助）

Question

#navigation_conatiner_7 的背景和边框不可见。我尝试将 overflow:auto 添加到其父级，它只显示滚动条。后来我尝试添加相同的内容，但后来它完全隐藏了。由于我的想法已经用完了，我想也许这里有人可能有答案。

这是代码：http: //jsfiddle.net/Tamaki/my5GV/

HTML：

<div id="navigation">
    <div id="holder">
        <div id="navigation_category_2">articles</div>
        <div id="navigation_category_3">columns</div>
        <div id="navigation_category_7">submit
            <div id="navigation_container_7">
                <div class="navigation_link"><span style="margin-left: 10px;">submit</span></div>
                <div class="navigation_link"><span style="margin-left: 10px;">applications</span></div>
                <div class="navigation_link"><span style="margin-left: 10px;">points</span></div>
            </div>
        </div>
    </div>
</div>

CSS：

#navigation {
    top: 0px !important;
    width: 100%;
    height: 60px;
    background-color: #eee;
    border-bottom: solid 3px #dd6a0c;
    position: fixed;
}

#holder {
    width: 960px;
    margin: 0 auto;
    height: inherit;
}

/* Navigation
============================*/

#navigation_category_2, #navigation_category_3, #navigation_category_7 {
    height: 60px;
    float: left;
    width: 120px;
    text-align: center;
    margin: 0 7px 0 8px;
    cursor: pointer;
    line-height: 60px;
    font-family: Impact, Arial, sans-serif;
    color: #111;
    font-size: 18px;
}

#navigation_category_2:hover, #navigation_category_3:hover, #navigation_category_7:hover {
    background-color: #dd6a0c;
    color: #eee;
}

#navigation_category_7:hover {
    background-color: #eee;
    color: #111;
}

#navigation_container_7 {
    top: 0;
    position: relative;
    display: none;
    width: 160px;
    left: -24px;
    border: 3px solid #dd6a0c;
    border-top: none;
    height: 0px;
    background-color: #eee;
}

#navigation_category_7:hover #navigation_container_7 {
    display: block;
}

.navigation_link {
    top: 0;
    width: inherit;
    height: 26px;
    text-align: left;
    font-size: 11px;
    font-family: Verdana;
    color: #111;
    line-height: 26px;
    text-transform: capitalize;
    font-weight: bold;
}

.navigation_link:hover {
    background-color: #dd6a0c;
    color: #eee;
}

Answer 1

从height=0px_#navigation_conatiner_7

Answer 2

代码的问题是您看到的颜色实际上是从粘贴在容器内的链接派生的。

添加了这个

#navigation_category_7 #navigation_container_7 .navigation_link {
background-color: #eee;
}

现在可以了。检查http://jsfiddle.net/my5GV/2/

Answer 3

尝试更改css：

#navigation_category_2:hover, #navigation_category_3:hover, #navigation_category_7:hover {
    background-color: #dd6a0c;
    color: #eee;
}

#navigation_category_7:hover {
    background-color: #eee;
    color: #111;
}

对此

#navigation_category_2:hover, #navigation_category_3:hover {//you were calling #navigation_category_7 here to
    background-color: #dd6a0c;
    color: #eee;
}

#navigation_category_7:hover {
    background-color: #eee; //this color is giving you the error, change if to 6 letter or rgba
    color: #111;
}

Answer 4

您不应该将 's 用于菜单。尝试使用 ul 和 li 标签，而不是像这样：

html:

<ul>
    <li><a href="LINK">MENU#1</a></li>
    <li><a href="LINK">MENU#2</a>
        <ul class="submenu-1">
            <li><a href="LINK">MENU#3</a>
                <ul class="submenu-2">
                    <li><a href="LINK">MENU#4</a></li>
                </ul>
            </li>
        </ul>
    </li>
        <li><a href="LINK">MENU#5</a>
        <ul class="submenu-1">
            <li><a href="LINK">MENU#6</a></li>
        </ul>
    </li>
</ul>

CSS：

ul li {
    // All menus li
}
ul li ul { // All submenus
    margin-top: 10px;
    margin-left: 10px;
}
ul li ul li { // All submenus li

}
ul.submenu-1 { // UL > LI > UL

}
ul.submenu-2 { // UL > LI > UL > LI > UL

}

Answer 5

更改以下 id ：

 #navigation_category_7:hover {
        background-color: #dd6a0c;
        color: #111;
    }

Answer 6

改变

#navigation_category_2:hover,
#navigation_category_3:hover, 
#navigation_category_7:hover {
background-color: #dd6a0c;
color: #eee;
}

至

#navigation_category_2:hover,
#navigation_category_3:hover, 
#navigation_category_7:hover {
background-color: #dd6a0c !important;
color: #eee !important;
}

只需添加 !important 以防止覆盖。