CSS定位,需要一些建议

Question

这是我的HTML代码

<div id="container">
        <div id="topleft"></div>
        <div id="topright"></div>
        <div id="bottomleft"></div>
        <div id="bottomright"></div>
    </div>

这是我的css代码

#container{
    width: 400px;
    height: 400px;
    background-color: red;
    margin: 0 auto;

}

#topright{
    width: 50px;
    height: 50px;
    background-color: black;
    position: relative;
    top:0px;
    right:0px;
}
#topleft{
    width: 50px;
    height: 50px;
    background-color: black;
    position:relative;
    top:0px;
    left:350px;
}

#bottomright{
    width: 50px;
    height: 50px;
    background-color: black;
    position: relative;
    top:250px;
    right:0px;
}
#bottomleft{
    width: 50px;
    height: 50px;
    background-color: black;
    position:relative;
    top:250px;
    left:350px;
}

这是输出 http://s23.postimg.org/dhgy9mpq3/image.png

我需要获得的是,所有4个黑色方块都位于红色方块的角落,就像在这张图片中一样,我应该更改或添加代码？THX http://postimg.org/image/r5kv15l5v/

Answer 1

添加position:relative到#container和position:absolute到内部的div.

您可以将常用属性与逗号结合使用,例如

#bottomright,#bottomleft{css properties}

CSS:

#container {
    position: relative;
}
#container > div {
    width: 50px;
    height: 50px;
    background-color: black;
    position: absolute;
}
#bottomright, #bottomleft {
    bottom:0;
}
#topright, #topleft {
    top:0;
}
#bottomleft, #topleft {
    left:0;
}
#bottomright, #topright {
    right:0;
}

DEMO在这里.