Question

我想将我的div设为中心，这样无论你在网站上观看的屏幕有多大，它都完全集中在页面的中间位置。

请帮助谢谢！

HTML：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>

<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>
<script type="text/javascript" src="java.js"></script>

<head>
<link rel="stylesheet" href="css/style.css" type="text/css"/>
<title>Test Website</title>
<meta name="" content="">

</head>
<body onload="Slider();">

<header>

    <div id="title">
    <h1 class="headertext">Test Website</h1>
    </div>

    <div id="menubar">
        <ul>
          <li><a href="#content">slideshow</a></li>
          <li><a href="#naturepictures">naturepictures</a></li>
          <li><a href="#hello">homepage</a></li>
          <li><a href="#hello">homepage</a></li>
          <li><a href="#hello">contact</a></li>         
      </ul>
     </div>

</header>
    <div class="hide"></div>

        <div id="rightmenu">
            <ul>
                <li><a href="#content">slideshow</a></li>
                <li><a href="#naturepictures">naturepictures</a></li>
                <li><a href="#hello">homepage</a></li>
                <li><a href="#hello">homepage</a></li>
                <li><a href="#hello">contact</a></li>

                <div id="youtubelogo">
                    <a href="http://www.youtube.com" target="_blank">
                    <img src="images/youtubelogo.gif" alt="" width="90" height="50" align="middle">
                    </a>
                </div>          
            </ul>
                <div id="righttriangle1"></div>
                <div id="righttriangle2"></div>
                <div id="righttriangle3"></div>
                <div id="righttriangle4"></div>
                <div id="righttriangle5"></div>
            </div>

        <div id="leftmenu">
            <ul>
                <li><a href="#content">slideshow</a></li>
                <li><a href="#naturepictures">naturepictures</a></li>
                <li><a href="#hello">homepage</a></li>
                <li><a href="#hello">homepage</a></li>
                <li><a href="#hello">contact</a></li>
            </ul>
                <div id="lefttriangle"></div>
        </div>      

        <div id="content">

            <h1 style="font-weight: normal;">Contentpage</h1><br>

            Picture slideshow
            <br>
            <br>

            <div class="slider">
                <img id="1" src="images/car1.jpg" border="0" alt="car1"/>
                <img id="2" src="images/car2.jpg" border="0" alt="car2"/>
                <img id="3" src="images/car3.jpg" border="0" alt="car3"/>
                <img id="4" src="images/car4.jpg" border="0" alt="car4"/>
                <img id="5" src="images/car5.jpg" border="0" alt="car5"/>
            </div><!--slider end-->

            <div class="shadowbottom"></div>    

            <div id="naturepictures">

            <h1 style="font-weight: normal;">Pictures</h1>
            <br>
            <img style="width: 800px; height: 600px;" src="images/nature1.gif"/>

            </div><!--naturepictures end-->

        </div><!--content end-->

</body>
</html>

CSS：

*{
    margin: 0 auto 0 auto;
    text-align: left;
    color: #ffffff;
}

body{
    margin: 0;
    text-align: left;
    font-size: 13px;
    font-family: arial, helvetica, sens-serif;
    color: #ffffff;
    width: 1200px;
    height: auto;
    background: #fdf7e3;
}

header {
    position: fixed;
    width: 100%;
    top: 0;
    background: rgba(0,0,0,0.8);
    z-index: 10;
}

h1{
    color: black;
    text-align: center;
}

.hide
{
    position: fixed;
    width: 100%;
    top: 0;
    background: rgba(255,255,255,1);
    z-index:5;  
    height: 123px;
}
.headertext{
    margin-top: 15px;
    text-align: center;
    color: white;
}

#title{
    font-size: 20px;
    margin: -10px 0 30px 0;
    width: 100%;
    height: 70px;
    border-top: 2px solid #000000;
    border-bottom: 2px solid #000000;
}

#menubar{
    float: left;
    clear: both;
    width: 100%;
    height: 30px;
    list-style: none;
    border-bottom: 2px solid #010000;
}

#menubar ul{
    list-style: none;
    margin-top: -20px;
    text-align: center;
}

#menubar ul li{
    list-style: none;
    display: inline;
    padding-right: 80px;
}

#menubar ul li a{
    color: #ffffff;
    text-decoration: none;
    font-size: 20px;
    font-weight: bold;
}

#menubar ul li a:hover{
    border-bottom: 2px solid #ffffff;
}

#rightmenu{
    margin-top: -20px;
    position: fixed;
    right: 0;
    width: 160px;
    height: 530px;
    list-style: none;
    background: rgba(0,0,0,0.8);
    color: #ffffff;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
}

#rightmenu ul{
    margin-top: 23px;
}

#rightmenu ul li{
    display: block;
    padding-bottom: 50px;
}

#rightmenu ul li a{
    font-weight: bold;
    text-decoration: none;
    color: #ffffff;
    font-size: 15px;
    text-align: center;
    margin-left: -15px;
}

#rightmenu ul li a:hover{
    border-bottom: 2px solid #ffffff;
    transition: opacity .5s ease-in;
    opacity: 1;
}

#righttriangle1 {
   width: 0;
   height: 0;
   border-right: 25px solid rgba(0,0,0,0.8);
   border-top: 34px solid transparent;
   border-bottom: 34px solid transparent;
   margin-top: -410px;
   margin-right: 160px;
}

#righttriangle2 {
    width: 0;
    height: 0;
    border-right: 25px solid rgba(0,0,0,0.8);
    border-top: 34px solid transparent;
    border-bottom: 34px solid transparent;
    margin-right: 160px;
}

#righttriangle3 {
   width: 0;
   height: 0;
   border-right: 25px solid rgba(0,0,0,0.8);
   border-top: 34px solid transparent;
   border-bottom: 34px solid transparent;
   margin-right: 160px;
}

#righttriangle4 {
   width: 0;
   height: 0;
   border-right: 25px solid rgba(0,0,0,0.8);
   border-top: 34px solid transparent;
   border-bottom: 34px solid transparent;
   margin-right: 160px;
}

#righttriangle5 {
   width: 0;
   height: 0;
   border-right: 25px solid rgba(0,0,0,0.8);
   border-top: 34px solid transparent;
   border-bottom: 34px solid transparent;
   margin-right: 160px;
}

#leftmenu{
    position: fixed;    
    left: 0;
    margin-top: -20px;
    width: 160px;
    height: 450px;
    list-style: none;
    background: rgba(0,0,0,0.8);
    color: #ffffff;
    border-left: 2px solid #010000;
    border-right: 2px solid #010000;
}

#leftmenu ul{
    margin-top: 23px;
}

#leftmenu ul li{
    display: block;
    padding-bottom: 50px;
}

#leftmenu ul li a{
    font-weight: bold;
    text-decoration: none;
    color: #ffffff;
    font-size: 15px;
    margin-left: -15px;
}

#leftmenu ul li a:hover{
    border-bottom: 2px solid #ffffff;
    transition: opacity .5s ease-in;
    opacity: 1;
}

#lefttriangle{
    margin-top: 89px;
    margin-left: -1px;
    width: 0px; 
    height: 0;
    border-top: 80px solid rgba(0,0,0,0.8);
    border-left: 82px solid transparent; 
    border-right: 82px solid transparent; 
}

#content{
    width: 1000px;
    margin: 0 auto;
    margin-top: 135px;
    color: #000000;
    font-weight: bold;
    text-align: center;
    font-size: 15px;
}

#naturepictures{
    color: black;
    top: 1200px;
    width: 80px;
    height: 300px;
    text-align: center;
    margin-left: 440px;
}

.naturepicture{
    height: 400px;
    width: 600px;
}

.slider{
    margin-top: 20px;
    width: 600px;
    height: 400px;
    overflow: hidden;
    margin: auto;
    border-radius: 10px;
    vertical-align: middle;
}

.shadowbottom{
    background-image:url(../images/shadow.png);
    background-repeat: no-repeat;
    background-position: top;
    width: 850px;
    height: 144px;
    vertical-align: middle;
    margin-top: -50px;
}

.slider img{
    width: 600px;
    height: 400px;
    display: none;
}

我已经尝试了很多东西，但不明白为什么它会很奇怪谢谢你的帮助

Answer 1

试试这个

#div_id {
 width: 50%;
 margin: 0 auto;
}

Answer 2

你可以试试这个：

Fiddle Link here

<div class="mainwrapper" >
    <div class="innerwrapper">
    <div class="contentdiv">test</div>
    </div>
</div>

您将在上面的JSFiddle链接中找到工作示例...

新年快乐......：）

无法弄清楚如何水平居中我的内容div

2 个答案: