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 Circular Cropping of Rectangle Image
The approach is wrong, you need to apply the border-radius
to the container div
instead of the actual image.
This would work:
.image-cropper {
width: 100px;
height: 100px;
position: relative;
overflow: hidden;
border-radius: 50%;
}
img {
display: inline;
margin: 0 auto;
height: 100%;
width: auto;
}
<div class="image-cropper">
<img src="https://via.placeholder.com/150" class="rounded" />
</div>
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 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>
CSS 3 Shape: Inverse Circle or Cut Out Circle
Update: CSS3 Radial Background Gradient Option
(For those browsers supporting it--tested in FF and Chrome--IE10, Safari should work too).
One "problem" with my original answer is those situations where one does not have a solid background that they are working against. This update creates the same effect allowing for a transparent "gap" between the circle and it's inverse cutout.
See example fiddle.
CSS
.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-left: 30px;
margin-left: -30px;
/* real borders */
border-left: none;
-webkit-border-top-right-radius: 20px;
-webkit-border-bottom-right-radius: 20px;
-moz-border-radius-topright: 20px;
-moz-border-radius-bottomright: 20px;
border-top-right-radius: 20px;
border-bottom-right-radius: 20px;
/* the inverse circle "cut" */
background-image: -moz-radial-gradient(
-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(-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(-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(-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(-23px 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);
}
Original Answer
Took more effort than I expected to get the z-indexing to work (this seems to ignore the negative z-index), however, this gives a nice clean look (tested in IE9, FF, Chrome):
HTML
<div id="a" class="inversePair">A</div>
<div id="b" class="inversePair">B</div>
CSS
.inversePair {
border: 1px solid black;
background: grey;
display: inline-block;
position: relative;
height: 100px;
text-align: center;
line-height: 100px;
vertical-align: middle;
}
#a {
width: 100px;
border-radius: 50px;
}
#a:before {
content:' ';
left: -6px;
top: -6px;
position: absolute;
z-index: -1;
width: 112px; /* 5px gap */
height: 112px;
border-radius: 56px;
background-color: white;
}
#b {
width: 200px;
z-index: -2;
padding-left: 50px;
margin-left: -55px;
overflow: hidden;
-webkit-border-top-right-radius: 20px;
-webkit-border-bottom-right-radius: 20px;
-moz-border-radius-topright: 20px;
-moz-border-radius-bottomright: 20px;
border-top-right-radius: 20px;
border-bottom-right-radius: 20px;
}
#b:before {
content:' ';
left: -58px;
top: -7px;
position: absolute;
width: 114px; /* 5px gap, 1px border */
height: 114px;
border-radius: 57px;
background-color: black;
}
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>
Circle over a rectangle using CSS
Something like this? 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;
}
the "cut-off" effect is achieved using a border on the circle.
If my asnwser helped you out, can you please select it? thanks
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