html, body {
    margin: 1em;
    padding: 0;
}

.grid-container {
    border: 2px solid black;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .5em;
}

.grid-item {
    background-color: lightgreen;
    padding: .2em;
    font-size: 1.5em;
    color: black;
    border: 1px solid #999;
    display: flex;
    align-items: center;
    justify-content: center;
} 

.explicit {
    /* background-color: yellow; */
}