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？谢谢 http://postimg.org/image/r5kv15l5v/

Answer 1

将position:relative添加到#container和position:absolute添加到内部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 here.

Answer 2

solution

为什么你的css失败了？对于底层对齐，请使用bottom:0;left:0;而不是top和right ....这是正确的语义，否则会失败position的概念...也是，让孩子absolute和父母relative !! :)

 #container {
        width: 400px;
        height: 400px;
        background-color: red;
        margin: 0 auto;
        position: relative;
    }
    #topright {
        width: 50px;
        height: 50px;
        background-color: black;
        position: absolute;
        top:0px;
        right:0px;
    }
    #topleft {
        width: 50px;
        height: 50px;
        background-color: black;
        position:absolute;
        top:0px;
        left:0;
    }
    #bottomright {
        width: 50px;
        height: 50px;
        background-color: black;
        position: absolute;
        bottom:0;
        right:0px;
    }
    #bottomleft {
        width: 50px;
        height: 50px;
        background-color: black;
        position:absolute;
        bottom:0;
        left:0;
    }

Answer 3

制作#container position relative。在absolute。

里面的div

完整代码

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

}

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

#bottomright{
    width: 50px;
    height: 50px;
    background-color: black;
    position: absolute;
    bottom:0px; //change
    right:0px;
}
#bottomleft{
    width: 50px;
    height: 50px;
    background-color: black;
    position:absolute; //change
    bottom:0px; //change
    left:0px; //change
}

Answer 4

Demo

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

}

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

#bottomright{
    width: 50px;
    height: 50px;
    background-color: black;
    position: absolute;
    bottom:0px;
    right:0px;
}
#bottomleft{
    width: 50px;
    height: 50px;
    background-color: black;
    position:absolute;
    bottom:0;
    left:0;
}

Answer 5

以下css将起作用

#container {
    background-color: #FF0000;
    height: 400px;
    margin: 0 auto;
    position: relative;
    width: 400px;
}
#topleft {
    background-color: #000000;
    height: 50px;
    left: 0;
    position: absolute;
    top: 0;
    width: 50px;
} 

#topright {
    background-color: #000000;
    height: 50px;
    position: absolute;
    right: 0;
    top: 0;
    width: 50px;
}
#bottomleft {
    background-color: #000000;
    height: 50px;
    left: 350px;
    position: absolute;
    top: 350px;
    width: 50px;
}
#bottomright {
    background-color: #000000;
    height: 50px;
    left: 0;
    position: absolute;
    top: 350px;
    width: 50px;
}

CSS定位，需要一些建议

5 个答案: