CSS Grid

CSS Grid Layout is a 2-dimensional system (cols and rows) which is the main difference to CSS Flexbox which is 1-dimensional system.

It makes easier to design web pages without having to use floats and positioning.

Define a grid:

<div class="wrapper">
  <div class="box a">A</div>
  <div class="box b">B</div>
  <div class="box c">C</div>
  <div class="box d">D</div>
  <div class="box e">E</div>
  <div class="box f">F</div>
</div>

Now the stylesheet:

.wrapper {
  display: grid;
  grid-template-columns: 33% 33% 33%;
  grid-gap: 9px;
  background-color: pink;
  color: #444;
}

.box {
  background-color: #444;
  color: #fff;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}

See and edit it on my codepen: Codepen

It can be seen I quickly designed my own grid based on percentages. My plan was to fill in all the available space between the 40px frame I designed within the body.

References CSS Grid Layout