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              <div class="container">
  <div class="item item1"></div>
  <div class="item item2"></div>
  <div class="item item3"></div>
  <div class="item item4"></div>
  <div class="item item5"></div>
  <div class="item item5"></div>
              .container {
  display: grid;
  grid-template-columns: 150px 150px 150px;
  grid-template-rows: 150px 150px;
  grid-gap: 1rem;


body {
  background-color: #3b404e;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;

.item {
  background-color: #1EAAFC;
  background-image: linear-gradient(130deg, #6C52D9 0%, #1EAAFC 85%, #3EDFD7 100%);
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  color: #fff;
  border-radius: 4px;
  border: 6px solid #171717;
Firefox has the best developer tools for building with CSS Grid Layout
Ready to step up your game with CSS Grid? Just follow these steps:

Step 1: Download Firefox Nightly

Step 2: While using Nightly, open Developer Tools
Windows: Ctrl + Shift + I
Mac: Cmd + Opt + I

Step 3: Select the layout panel, and then select the overlay grid you'd like to display

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