.twocolumns {
    column-count: 2;
}

.centerimage {
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-top: 10px;
    margin-bottom: 10px;
}

body {
    background-color: ivory;
}
h1,h2,h3 {
    text-align: center;
}