h1 {
    text-align: center;
}

a:link {
    color: blue;
    text-decoration: none;
}

a:hover {
    color: blue;
    text-decoration: underline;
}

a:visited {
    color: purple;
    text-decoration: none;
}

a:active {
    color: red;
    text-decoration: none;
}

img {
    vertical-align: middle;
}

.columns {
    display: flex;
    justify-content: space-between;
}