how to make a spaciel line in css? - css

Question

i try to make that in css
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but i only sucsses to
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https://prnt.sc/l19itx
this my code:
.halfCircleLeft{
height:90px;
width:45px;
border-radius: 90px 0 0 90px;
background:green;
}
how i can do that?

Answer 1

You can set overflow: hidden to the container and make the inner div a big circle, it will give you the effect you want.
.cont{
position: relative;
overflow: hidden;
width: 200px;
height: 100px;
background-color: #e5e5e5;
}
.round-back{
top: -100px;
left: 50px;
position: absolute;
border-radius: 50%;
width: 300px;
height: 300px;
background-color: red;
}
<div class="cont">
<div class="round-back"></div>
</div>

Answer 2

This isn't exactly the shape that you have in your image, but it's simple and it's likely close enough:
#box {
border:1px solid #000;
border-radius: 10px 0px 0px 10px / 50% 0% 0% 50%;
width: 200px;
height: 100px;
background-color: #ccc;
}
<div id="box"></div>
The above solution uses elliptical border-radius, which is specified using a slash (/).
Another approach here is much closer to your original image, but it takes significantly more code to implement, and it's quite a bit more brittle too to customise:
#wrapper {
overflow: hidden;
width: 200px;
}
#box::before {
position: relative;
display: block;
content: "";
margin-left: -20px;
background: #ccc;
height: 400px;
width: 400px;
margin-top: -75%;
border-radius: 50%;
z-index: -10;
}
#box {
float: left;
position: relative;
margin-left: 20px;
width: 200px;
height: 100px;
background-color: #ccc;
}
#content {
position: absolute;
height: 100%;
width: 100%;
top: 0px;
}
<div id="wrapper">
<div id="box">
<div id="content">
</div>
</div>
</div>
This approach uses an oversized circle, which is then clipped by a #wrapper div using overflow: hidden;. The #content div isn't strictly necessary for the shape, but it may make it easier to position something inside the box.