如何在我的标题的底部中间添加一个半圆？ [英] How to add a half circle at the bottom middle of my header?

问题描述

这是我想要的样子：

我意识到这是一个丑陋的模型，显然当我这样做真的比例会看起来更好，但我想知道如何

I realize this is an ugly mockup and obviously when I do it for real the proportions will look better, but I am wondering how you would go about doing this with CSS.

fiddle在这里 http://jsfiddle.net/bU3QS/1/

fiddle is here http://jsfiddle.net/bU3QS/1/

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

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: #000;
    z-index: 10000;
    height: 110px;
    overflow: hidden;
}

推荐答案

c>：之后伪元素：

Use the :after pseudo element:

.header:after {
    content: '';
    position: absolute;
    background: black;
    width: 50px;
    height: 50px;
    z-index: 1;
    border-radius: 50%;    /* Makes the element circular */
    bottom: -25px;
    left: 50%;
    margin-left: -25px;
}

对于此解决方案， overflow：hidden; code>已从 .header CSS中移除。

For this solution, overflow: hidden; has been removed from the .header CSS.

这里是一个小提琴： http://jsfiddle.net/t97AX/

这是另一种方法，不依赖于半圆的宽度将其正确定位：

Here's another approach, that doesn't rely on the width of the semicircle to center it properly:

.header:after {
    content: '';
    position: relative;
    top: 100%;
    display: block;
    margin: 0 auto;
    background: red;
    width: 50px;
    height: 25px;
    border-radius: 0 0 50px 50px;
}

小提琴（为了清晰起见，半圆形为红色）： http://jsfiddle.net/x4mdC/

The fiddle (semicircle red for the sake of clarity): http://jsfiddle.net/x4mdC/

更多：之前和：之后： http://www.w3.org/TR/CSS2/selector.html#before-and-after

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