<div class="grid">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
body {
background: #000;
}
.grid {
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-auto-rows: 100px;
border-top: 1px solid transparent;
border-left: 1px solid transparent;
position: relative;
}
.grid:after {
content: '';
position: absolute;
height: 100%;
width: 1px;
background: #000;
top: 0;
right: 0;
}
.grid:before {
content: '';
position: absolute;
height: 1px;
width: 100%;
background: #000;
bottom: 0;
right: 0;
}
.item {
border-right: 1px solid #fff;
border-bottom: 1px solid #fff;
}
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.