<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
.parent{
display: grid;
grid: 50px / auto auto auto;
grid-gap: 5px;
background-color: DarkBlue;
padding: 3px;
}
.parent > div{
background-color: rgba(255, 255, 255, 0.8);
text-align: center;
padding: 15px 0;
}
</style>
</head>
<body>
<h1>CSS display: grid;</h1>
<div class="parent">
<div>innerDiv 1</div>
<div>innerDiv 2</div>
<div>innerDiv 3</div>
</div>
</body>
</html>