<div class="wrapper">
<div class="box"></div>
</div>
@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
width: 100vw;
min-height: 100vh;
font-family: "Exo", Arial, sans-serif;
background-color: #557;
color: #fff;
display: flex;
justify-content: center;
align-items: center;
}
.wrapper {
width: min(100%, 760px);
display: flex;
justify-content: center;
}
.box {
width: 100%;
height: max(40vh, 200px);
background-color: #09f;
}
.box {
--min-radius: 0px;
--max-radius: 8px;
--ideal-radius: 4px;
border-radius: max(
var(--min-radius),
min(var(--max-radius), (100vw - var(--ideal-radius) - 100%) * 9999)
);
}
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.