daveycroqet daveycroqet - 5 months ago 9
HTML Question

Add rounded borders to selected corners of an element

How could I go about constructing something like this with pure CSS?

SS

This is how far I've gotten so far: Fiddle

I'm struggling with how to get that rounded corner there, even if I continue to add additional

span
s.

CSS:



body {
background: #000;
}

.container {
position: relative;
width: 300px;
height: 150px;
margin: 10% auto;
}

.top-right {
position: absolute;
top: -10px;
right: 0;
width: 50px;
height: 1px;
background: white;
border-radius: 5px;
}

.box {
width: 100%;
height: 100%;
background: red;
border-radius: 15px;
display: flex;
align-items: center;
justify-content: center;
}

h3 {
color: white;
}

Answer

you can achieve that by using pseudo elements ::before/::after in .box using the properties border and border-radius

body {
  background: #000;
}
.container {
  width: 300px;
  height: 150px;
  margin: 3% auto 0 /* changed for demo */
}
h3 {
  color: white;
}
.box {
  width: 100%;
  height: 100%;
  background: red;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.box::before,
.box::after {
  content: "";
  position: absolute;
  border: solid white;
  width: 50px;
  height: 50px;
}
.box::before {
  top: -15px;
  left: -15px;
  border-top-left-radius: 15px;
  border-width: 5px 0 0 5px;
}
.box::after {
  bottom: -15px;
  right: -15px;
  border-bottom-right-radius: 15px;
  border-width: 0 5px 5px 0;
}
<div class="container">
  <div class="box">
    <h3>Content</h3>
  </div>
</div>