body,html{margin:0;padding:0;box-sizing:border-box;font-family:Segoe UI,Arial,sans-serif;background:#f0f2f5}*,*:before,*:after{box-sizing:inherit}.center{display:flex;justify-content:center;align-items:center}h1,h2,h3{margin:0 0 16px;line-height:1.2}@media (max-width: 600px){h1{font-size:1.5rem}h2{font-size:1.2rem}.center{flex-direction:column}}