<!DOCTYPE html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Flexible Box</title>
    <style>
        div.conteiner {
            background-color: lightsalmon;
            height: 300px;
            display: flex;
            flex-flow: row nowrap;
            justify-content: space-around;
            align-items: stretch;
        }

        div.item {
            background-color: lightskyblue;
            bord