How to add a half circle at the bottom middle of my header?

Tags: html,css,css3,shapes,css-shapes

Problem :

Here is how I want it to look:

header with half circle at bottom

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 is here

<div class="header">

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

Solution :

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;

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

Here's a fiddle:

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;

The fiddle (semicircle red for the sake of clarity):

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