magcms/materialize/css/style-page.css

html {
    height: 100%;
    width: 100%;
}

body {
    margin: 0;
    height: 100%;
    width: 100%;
}

section {
    margin-bottom: 4em;
}

.full-picture {
    height: 100%;
    width: 100%;
    min-height: 250px;
}

.bordered-picture img {
    height: 80%;
    width: 80%;
    margin-left: 10%;
    margin-right: 10%;
    margin-top: 3em;
}