<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.container {
width: 800px;
height: 500px;
margin: 0 auto;
display: flex;
background-color: #0e9aef;
}
.one {
background-color: goldenrod;
height: 200px;
width: 200px;
}
.two {
background-color: grey;
height: 200px;
/*flex-basis: 100px;*/
width: 100px;
flex-grow: 1;
}
.three {
background-color: antiquewhite;
height: 200px;
/*flex-basis: 100px;*/
width: 200px;
flex-grow: 1;
/*writing-mode: ;*/
}
</style>
</head>
<body>
<div class="container">
<div class="one"></div>
<div class="two"></div>
<div class="three"></div>
</div>
</body>
</html>