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HTML 

              
                <div class="cont">
  <h1>Grid Alignment</h1>
  
  <p>Aligning the grid in a case where the number of tracks do not equal the size of the container.</p>

  <h2>Initial values:</h2>
  <ul>
    <li>align-content: start</li>
    <li>justify-content: start</li>
  </ul>

  <p>The white area below is our grid container. It is 800x800 pixels. Our four column and four row track grid is in total 630x630 pixels including the gaps.</p>
  <p>By default it appears top left of the container.</p>
</div>
<div class="code">
  <div class="wrapper">
    <div class="item1">One</div>
    <div class="item2">Two</div>
    <div class="item3">Three</div>
    <div class="item4">Four</div>
  </div>
</div>

<div class="cont">
  <h2>Changing alignment of the grid</h2>
  <p>Chaning the values of align-content and justify-content to end we can move it to bottom right.</p>
</div>
<div class="code">
  <div class="wrapper example1">
    <div class="item1">One</div>
    <div class="item2">Two</div>
    <div class="item3">Three</div>
    <div class="item4">Four</div>
  </div>
</div>

<div class="cont">
  <h2>space-between and space-around</h2>
  <p>We can use the keyword values space-between or space-around. These will increase the gaps between items.</p>
</div>
<div class="code">
  <div class="wrapper example2">
    <div class="item1">One</div>
    <div class="item2">Two</div>
    <div class="item3">Three</div>
    <div class="item4">Four</div>
  </div>
</div>

<div class="cont">
  <h2>Centre the grid</h2>
  <p>The alignment properties make it easy to centre the grid.</p>
</div>
<div class="code">
  <div class="wrapper example3">
    <div class="item1">One</div>
    <div class="item2">Two</div>
    <div class="item3">Three</div>
    <div class="item4">Four</div>
  </div>
</div>


</div>
!

CSS 

              
                

.wrapper {
  width: 800px;
  height: 800px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 150px 150px 150px 150px;
  grid-template-rows: 150px 150px 150px 150px;
  grid-gap: 10px;
  background-color: #fafafa;
}

.example1 {
  align-content: end;
  justify-content: end;
}

.example2 {
  align-content: space-around;
  justify-content: space-between;
}

.example3 {
  align-content: center;
  justify-content: center;
}

.item1 {
  grid-column: 1 / 5;
  grid-row: 1 / 3;
}

.item2 {
  grid-column: 1 / 4;
  grid-row: 3;
}

.item3 {
  grid-column: 4;
  grid-row: 3 / 5;
}

.item4 {
  grid-column: 1 / 4;
  grid-row: 4;
}

.wrapper div {
  padding: 10px;
  background-color: rgba(41,73,130,.5);
  color: #fff;
  border-radius: 5px;
}

html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font: 1em/1.4 Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: #fafafa;
  color: #000;
  margin:0;
}

.cont {
  width: 800px;
  margin: 0 auto;
}

.code {
  background-color: #333;
  padding: 20px;
}
!

JS
!
999px

Console