.spaced {
    margin-top: 20px;
}
.matrix {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-collapse: collapse;
    text-align: center;
}
.matrix div {
    border: 1px solid #000;
    padding: 10px;
    margin: 0;
}

.matrix div:hover {
    cursor: pointer;
}
.tooltip {
    position: absolute;
    background-color: #fff;
    border: 1px solid #000;
    padding: 5px;
    display: none;
    z-index: 10;
}