<!doctype html>
<style>
body {
--peek: LightGreen;
--border: transparent;
margin:0;
}
.bg {
background-color: var(--peek);
background-image: linear-gradient(45deg, orange 0px, orange 5px, gainsboro 3px, gainsboro 25%, rgba(160,160,160,0.5) 25%, rgba(160,160,160,0.5) 50%, silver 50%, silver 75%, darkgray 75%, darkgray 99%, blue 99%);
background-size: 200px 50px;
background-repeat: no-repeat; /* FF defaults to no-repeat, Chrome to repeat */
}
main > * {
box-sizing: border-box;
}
.table {
width: 200px;
position: relative;
margin-top: 5px;
margin-left:5px;
}
.row {
width: 200px;
height: 50px;
}
.cell {
width: 50px;
height: 50px;
display: inline-block;
vertical-align: top;
}
.bigsquarecell {
width: 100px;
height: 100px;
display: inline-block;
vertical-align: top;
background-position-x: -50px;
}
.c2 {
background-position-x: -50px
}
.c3 {
background-position-x: -100px;
}
.c4 {
background-position-x: -150px;
}
.bottomrow > .cell {
margin-top: 5px;
}
</style>
<main>
<div class="table">
<div class="row bg"></div>
<div><div class="cell firstcell bg"></div><div class="bigsquarecell bg"></div><div class="cell c4 bg"></div></div>
<div class="row bg"></div>
<div style="position:absolute;top:-5px;left:-5px;bottom:-5px;right:-5px;border: 10px solid var(--border)"></div>
</div>
</main>