<style>
body {
    display: grid;
    grid-template-columns: 100px 50px;
}
div {
    background-color: blue;
}
</style>
<body>
<div>
    <span style="background-color: green">1</span>
</div>
<div>
    <span style="background-color: red">2</span>
</div>
</body>