style.css

* {
    font-family: Helvetica;
    font-size: 1.4em;
    color: rgb(58, 51, 51);
    text-align: center;
    color: white;
}

.container div:nth-child(1), div:nth-child(6) {
    background-color: #B8336A;
}

.container div:nth-child(2), div:nth-child(7) {
    background-color: #726DA8;
}

.container div:nth-child(3), div:nth-child(8) {
    background-color: #7D8CC4;
}

.container div:nth-child(4), div:nth-child(9) {
    background-color: #A0D2DB;
}

.container div:nth-child(5) {
    background-color: #C490D1;
}

.container div:nth-child(10) {
    background-color: tomato;
}


.container {
    display: grid;
    grid-template: repeat(3, 3em) / repeat(3, 3fr);
    grid-auto-rows: 3em;
    grid-gap: 10px;
}

.container div {
    text-align: center;
    vertical-align: middle;
    line-height: 130px; 
}