examples/flask/app/static/css/style.css
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
text-align: center;
}
.center {
margin: auto;
position: absolute;
top: 0; left: 0; bottom: 0; right: 0;
width: 50%;
height: 50%;
min-width: 200px;
max-width: 400px;
padding: 40px;
}
.circle-image {
width: 200px;
height: 200px;
border-radius: 100%;
display: block;
}