Circle the rectangle with CSS

Question

I want to create the same shape as the following image (effect between a circle and a rectangle):

I know that the shape of the circle is constructed using border-radius , and the rectangular shape with some unordered list has a display: block style . But I can’t figure out how to keep the circle above the rectangle so that it looks like part of the rectangle is cut off by a circle in the shape of a circle (white color space between the circle and the rectangle).

I tried shadow, outline, overflow, etc., but it does not work.
Can someone tell me how I can design a shape just like an image? - Thanks

Answer 1

- ? http://codepen.io/anon/pen/VvqRep

.rectangle{
  display:block;
  height:40px;
  width:150px;
  background:red;
  position:relative;
  margin-top:100px;
}

.circle{
  position:absolute;
  height:40px;
  width:40px;
  border-radius:40px;
  border:3px solid white;
  left:50%;
  margin-left:-25px;
  top: -20px;
    background:red;
}

.

asnwser , ?

Answer 2

:

.rectangle{
  display:block;
  height:50px;
  width:150px;
  background:red;
  position:relative;
  margin-top:100px;
    border-top-left-radius: .5em;
    border-top-right-radius: .5em;
}

.circle{
  position:absolute;
  height:40px;
  width:40px;
  border-radius:40px;
  border:3px solid white;
  left:50%;
  margin-left:-25px;
  top: -20px;
  background:red;
}

Answer 3

Check this:)

.base{
  height:80px;
  width:300px;
  background:#d33;
  position:relative;
  margin-top:100px;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
}

.circle{
  position:absolute;
  height:100px;
  width:100px;
  border-radius:50%;
  border:3px solid white;
  left:50%;
  margin-left:-55px;
  top: -40px;
  background: #d33;
}

<div class="base">
  <div class="circle"></div>
</div>

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Answer 4

#bg {
    position: relative;
    background: red;
    width: 200px;
    height: 50px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    margin-top: 50px;
}
#circle {
    position: absolute;
    background: red;
    margin-left: auto;
    margin-right: auto;
    left: 0;
    right: 0;    
    top: -50px;
    width: 75px;
    height: 75px;
    border: 3px solid #fff;
    border-radius: 50%;
}

<div id="bg">
    <div id="circle"></div>
</div>

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Answer 5

use this: html and css code:

CSS

#rectangle {
    width:300px;
    height:70px;
    position: relative;
    background: #cc0000;
    border-radius: 5px 5px 0 0;
}
#rectangle #circle {
    width:70px;
    height:70px;
    position: absolute;
    top:-35px;
    background:#cc0000;
    border:1px solid #fff;
    border-radius:70px;
    left: 50%;
    margin-left: -35px;
}

HTML:

<div id="rectangle">
    <div id="circle"></div>
</div>