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                <body class="grid-6">
    <header class="grid-element bg-gray grid-header">Шапка сайта</header>
    <aside class="grid-element bg-red grid-aside">Сайдбар</aside>
    <main class="grid-element bg-blue grid-main">Основной контент</main>


                body {
  margin: 0;
  font-family: sans-serif;

html * {
  box-sizing: border-box;

.grid-6 {
  display: grid;
  grid-template-areas: "header header header header header ."
                       "aside  aside  main   main   main   main";

.grid-element {
  padding: 5px;
  font-size: 14px;
  color: #fff;

.bg-gray {
  background: #717790;

.bg-red {
  background: #ff3c41;

.bg-blue {
  background: #0ebeff;

.grid-header {
  grid-area: header;
  height: 50px;

.grid-aside {
  grid-area: aside;

.grid-main {
  grid-area: main;