<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<style>
#container{
display: grid;
grid-template-columns: 100px 100px 100px 100px 100px 100px;
grid-template-rows: 100px 100px 100px 100px;
align-content:center;
}
.item {
font-size: 4em;
text-align: center;
border: 1px solid #e5e4e9;
}
.item-1 {
background-color: #ef342a;
grid-column-start: 1;
grid-column-end: 2;
grid-row-start: 1;
grid-row-end: 3;
}
.item-2 {
background-color: #f68f26;
grid-column-start: 1;
grid-column-end: 2;
grid-row-start: 3;
grid-row-end: 5;
}
.item-3 {
background-color: #4ba946;
grid-column-start: 2;
grid-column-end:6;
grid-row-start: 1;
grid-row-end: 2;
}
.item-4 {
background-color: #0376c2;
grid-column-start: 2;
grid-column-end:6;
grid-row-start: 2;
grid-row-end: 3;
z-index: 100;
}
.item-5 {
background-color: #c077af;
grid-column-start: 2;
grid-column-end:5;
grid-row-start: 3;
grid-row-end: 4;
}
.item-6 {
background-color: #f8d29d;
grid-column-start: 2;
grid-column-end:4;
grid-row-start: 4;
grid-row-end: 4;
}
.item-7 {
background-color: #b5a87f;
grid-column-start: 4;
grid-column-end:6;
grid-row-start: 3;
grid-row-end: 4;
z-index: 1;
}
.item-8 {
background-color: #d0e4a9;
grid-column-start: 4;
grid-column-end:6;
grid-row-start: 4;
grid-row-end: 4;
}
.item-9 {
background-color: #4dc7ec;
grid-column-start: 6;
grid-column-end: 7;
grid-row-start: 1;
grid-row-end: 3;
}
.item-10 {
background-color: #888888;
grid-column-start: 6;
grid-column-end:7;
grid-row-start: 3;
grid-row-end: 5;
}
</style>
<body>
<div>
<div id="container">
<div class="item item-1">1</div>
<div class="item item-2">2</div>
<div class="item item-3">3</div>
<div class="item item-4">4</div>
<div class="item item-5">5</div>
<div class="item item-6">6</div>
<div class="item item-7">7</div>
<div class="item item-8">8</div>
<div class="item item-9">9</div>
<div class="item item-10">10</div>
</div>
</div>
</body>
</html>