div.sponsors
{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    grid-auto-rows: 100px;
}

div.sponsors > *
{
    display: flex;
    align-items: center;
    justify-content: center;
}

div.sponsors img
{
    width: 150px;
}

div.sponsors2
{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    grid-auto-rows: 100px;
    margin-top: -2em;
}

div.sponsors2 > *
{
    display: flex;
    align-items: center;
    justify-content: center;
}

div.sponsors2 img
{
    width: 100px;
}