Div with a Transparent Cut Out Circle

Transparent hollow or cut out circle

You can achieve a transparent cut out circle with 2 different techniques :

1.SVG

The following examples use an inline svg. The first snippet uses the mask element to cut out the transparent circle and the second hollow circle is made with a path element. The circle is made with 2 arc commands :

With the mask element :

body{background:url('https://farm9.staticflickr.com/8760/17195790401_ceeeafcddb_o.jpg');background-size:cover;}

<svg viewbox="0 0 100 50" width="100%">
  <defs>
    <mask id="mask" x="0" y="0" width="80" height="30">
      <rect x="5" y="5" width="90" height="40" fill="#fff"/>
      <circle cx="50" cy="25" r="15" />
    </mask>
  </defs>
  <rect x="0" y="0" width="100" height="50" mask="url(#mask)" fill-opacity="0.7"/>    
</svg>

Div with a transparent cut out circle

In order to have the white cut out circle transparent and let the background show through it, you can use box-shadows on a pseudo element to minimize markup.

In the following demo, the blue color of the shape is set with the box shadow and not the background-color property.

DEMO

output:

This can also be responsive: demo

HTML:

<div></div>

CSS:

div {
  width: 300px;
  height: 300px;
  position: relative;
  overflow: hidden;
}

div::before {
  content: '';
  position: absolute;
  bottom: 50%;
  width: 100%;
  height: 100%;
  border-radius: 100%;
  box-shadow: 0px 300px 0px 300px #448CCB;
}

Transparent half circle cut out of a div

May be can do it with CSS :after pseudo property like this:

body {  background: green;}
.rect {  height: 100px;  width: 100px;  background: rgba(0, 0, 0, 0.5);  position: relative;  margin-top: 100px;  margin-left: 100px;}
.circle {  display: block;  width: 100px;  height: 50px;  top: -50px;  left: 0;  overflow: hidden;  position: absolute;}
.circle:after {  content: '';  width: 100px;  height: 100px;  -moz-border-radius: 100px;  -webkit-border-radius: 100px;  border-radius: 100px;  background: rgba(0, 0, 0, 0);  position: absolute;  top: -100px;  left: -40px;  border: 40px solid rgba(0, 0, 0, 0.5);}

<div class="rect"> <span class="circle"></span></div>

How to create the transparent circle with cut inside?

You can do this with :after pseudo-element

.circle {  width: 150px;  height: 150px;  border-top: 2px solid black;  border-left: 2px solid black;  border-right: 2px solid black;  border-bottom: 2px solid transparent;  border-radius: 50%;  position: relative;  transform: rotate(30deg);}
.circle:after {  content: '';  position: absolute;  bottom: 0;  border-radius: 50%;  height: 10px;  width: 40px;  left: 50%;  transform: translate(-50%, 7%);  border-bottom: 2px solid black;  border-top: 2px solid transparent;  border-left: 2px solid transparent;  border-right: 2px solid transparent;}

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

CSS Cut out circle from a rectangular shape

You can do this using a single element (plus a pseudo element) using radial-gradient background for the parent element while the pseudo-element creates the circle.

div:before {  /* creates the red circle */  position: absolute;  content: '';  width: 90px;  height: 90px;  top: -75px;  /* top = -75px, radius = 45px, so circle's center point is at -30px */  left: calc(50% - 45px);  background-color: red;  border-radius: 50%;}div {  position: relative;  margin: 100px auto 0 auto;  width: 90%;  height: 150px;  border-radius: 6px;      /* only the below creates the transparent gap and the fill */  background: radial-gradient(50px 50px at 50% -30px, rgba(0, 0, 0, 0) 49.5px, rgba(0, 0, 0, .8) 50.5px);  /* use same center point as with concentric circles but larger radius */}
/* just for demo */
body,html {  font-size: 18px;}body {  background-image: radial-gradient(circle, #3F9CBA 0%, #153346 100%);}

<div></div>

CSS 3 Shape: “Inverse Circle” or “Cut Out Circle”

You can use the following solution (original answer):

body {  padding: 10px;  background: url(http://www.dummyimage.com/12x16/ff0000/ffffff.png&text=X++) top left repeat;}.inversePair {  border: 1px solid black;  display: inline-block;  position: relative;  height: 100px;  text-align: center;  line-height: 100px;  vertical-align: middle;}#a {  width: 100px;  border-radius: 50px;  background: grey;  z-index: 1;}#b {  width: 200px;  /* need to play with margin/padding adjustment       based on your desired "gap" */  padding-right: 30px;  margin-right: -30px;  /* real borders */  border-right: none;  -webkit-border-top-left-radius: 20px;  -webkit-border-bottom-left-radius: 20px;  -moz-border-radius-topleft: 20px;  -moz-border-radius-bottomleft: 20px;  border-top-left-radius: 20px;  border-bottom-left-radius: 20px;  /* the inverse circle "cut" */  background-image: -moz-radial-gradient(calc(100% + 23px) 50%, /* the -23px left position varies by your "gap" */  circle closest-corner, /* keep radius to half height */  transparent 0, /* transparent at center */  transparent 55px, /*transparent at edge of gap */  black 56px, /* start circle "border" */  grey 57px/* end circle border and begin color of rest of background */  );  background-image: -webkit-radial-gradient(calc(100% + 23px) 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);  background-image: -ms-radial-gradient(calc(100% + 23px) 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);  background-image: -o-radial-gradient(calc(100% + 23px) 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);  background-image: radial-gradient(calc(100% + 23px) 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);}

<div id="b" class="inversePair">B</div><div id="a" class="inversePair">A</div>

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