How to use CSS3 to implement a navigation drop-down menu (complete code attached)

In the current web page structure, the navigation menu bar occupies a very important position, because it can not only display examples, but also give you the most intuitive impression of the content. As we all know, in HTML

< ;li>

The menu can be graded, then we can cooperate with css3 to implement the navigation drop-down menu. What this article brings to you is about how to use CSS3 to implement a navigation drop-down menu. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The principle of using css3 to implement navigation drop-down menu

First, use the

• > in HTML ;

To make the menu, we will use a hover statement, that is, when the mouse hovers in a certain area, it will trigger the display of the lower-level menu. What we need to know is the display attribute. We will The properties of block and none will be used to appear and hide the drop-down menu. Then we will define position for each menu to determine the location of the menu, and finally use the ::after pseudo-element selector to clear the float.

Steps to use css3 to implement navigation drop-down menu

##Step 1: Use HTML to create a menu style

<nav>
        <ul>
            <li><a href="#">导航一</a>
                <ul>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                </ul>
            </li>
            <li><a href="#">导航二</a></li>
            <li><a href="#">导航三</a>
                <ul>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a>
                        <ul>
                            <li><a href="#">三级导航</a></li>
                            <li><a href="#">三级导航</a></li>
                            <li><a href="#">三级导航</a></li>
                        </ul>
                    </li>
                    <li><a href="#">二级导航</a></li>
                </ul>
            </li>
            <li><a href="#">导航四</a>
                <ul>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                </ul>
            </li>
            <li><a href="#">导航五</a>
                <ul>
                    <li><a href="#">二级导航</a></li>
                    <li><a href="#">二级导航</a></li>
                </ul> 
            </li>
            <li><a href="#">导航六</a></li>
        </ul>
    </nav>

Step 2: Use css3 to implement the drop-down menu triggered by mouse hover

nav {
    margin:100px auto;
    text-align:center;
}
nav ul {
    border-radius:10px;
    background:linear-gradient(to bottom,#efefef,#bbbbbb);
    padding:0 20px;
    display:inline-table;
    position:relative;  
    box-shadow:1px 1px 3px #666;
}
nav ul ul {
    display:none;
}
nav ul li {
    float:left; 
}
nav ul::after {
    content:"";
    display:block;
    clear:both;
}
nav ul li a {
    display:block;
    padding:25px 40px;
    color:#000;
    text-decoration:none;
    font-family:"微软雅黑";
}
nav ul li:hover > ul {
    display:block;
}
nav ul li:hover {
    background:linear-gradient(to bottom,#4f5964,#5f6975);
}
nav ul li:hover a {
    color:#FFF;
}
nav ul ul {
    background:#5f6975;
    border-radius:0;
    position:absolute;
    top:100%;
    padding:0;
}
nav ul ul li {
    float:none;
    border-top:1px solid #6b727c;
    border-bottom:1px solid #575f6a;
}
nav ul ul li a {
    color:#FFF;
}   
nav ul ul li a:hover {
    background:#4b545f;
}
nav ul ul ul {
    width:100%;
    position:absolute;
    left:100%;
    top:50%;
}

Step 3: Beautify according to the requirements of the menu style

The drop-down menu style is as shown in the picture

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