Edit in JSFiddle

Result
HTML
JavaScript
CSS

<!DOCTYPE html>
<html>

  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Grid</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="./main.css" />
  </head>

  <body>
    <div class="dashboard">

    </div>

    <div class="container">
      <header></header>
      <section class="sidebar"></section>
      <main></main>
      <footer></footer>
    </div>
  </body>

</html>

const JUSTIFY_ITEMS = ['stretch', 'start', 'end', 'center'];

const ALIGN_ITEMS = ['stretch', 'start', 'end', 'center'];

const JUSTIFY_CONTENT = [
  'stretch',
  'start',
  'end',
  'center',
  'space-between',
  'space-around',
  'space-evenly'
];

const ALIGN_CONTENT = [
  'stretch',
  'start',
  'end',
  'center',
  'space-between',
  'space-around',
  'space-evenly'
];

function changeAlignStyle(prop, value) {
  const el = document.querySelector('.container');
  el.style[prop] = value;
}

function createRadio() {
  const fragment = document.createDocumentFragment();
  [
    {
      prop: 'justify-items',
      values: JUSTIFY_ITEMS
    },
    {
      prop: 'align-items',
      values: ALIGN_ITEMS
    },
    {
      prop: 'justify-content',
      values: JUSTIFY_CONTENT
    },
    {
      prop: 'align-content',
      values: ALIGN_CONTENT
    }
  ].forEach(({ prop, values }) => {
    const row = document.createElement('div');
    const title = document.createElement('h3');
    title.textContent = prop;
    const radioJar = document.createElement('div');
    values.forEach(value => {
      const label = document.createElement('label');
      const name = document.createElement('span');
      const radio = document.createElement('input');
      label.style.marginRight = '1em';
      name.textContent = value;
      radio.name = prop;
      radio.type = 'radio';
      radio.onclick = () => changeAlignStyle(prop, value);
      [radio, name].forEach(v => label.appendChild(v));
      radioJar.appendChild(label);
    });
    [title, radioJar].forEach(v => row.appendChild(v));
    fragment.appendChild(row);
  });
  document.querySelector('.dashboard').appendChild(fragment);
}

createRadio();

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  height: 600px;
}

.container {
  flex: 1 1 0;
  display: grid;
  margin-top: 10px;
  background: #fefefe;
  grid-template-columns: 40% 40%;
  grid-template-rows: repeat(2, 40%);
  background: #f6f6f6;
}

header,
footer,
.sidebar,
main {
  padding: 20px;
  box-sizing: border-box;
}

header {
  background: #ddd;
}

footer {
  background: #aaa;
}

.sidebar {
  background: #888;
}

main {
  background: #ccc;
}