সিএসএস flex-basis

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.container {
  display: flex;
  width: 400px;
  gap: 5px;
}

.container > div {
  height: 50px;
  background-color: coral;
}

.small {
  flex-basis: 50px;
}

.medium {
  flex-basis: 100px;
}

.large {
  flex-basis: 150px;
}
</style>
</head>
<body>

<div class="container">
  <div class="small"></div>
  <div class="medium"></div>
  <div class="large"></div>
</div>

</body>
</html>