.demo{max-width:900px;padding-top:3rem;padding-bottom:4rem}
.demo>h1{max-width:650px}
.demo__lead{font-size:1.2rem;line-height:1.55;max-width:65ch}
.demo .dlg{max-width:800px}
@media(max-width:600px){.demo{padding-top:1.5rem;padding-bottom:2rem}.demo__lead{font-size:1rem}}

.lesson-demo{max-width:900px;margin:0 auto;padding:0 22px 2rem}
.lesson-demo .article{max-width:none}
.demo__cta{border-top:1px solid #dce7eb;padding-top:2rem}
.demo__cta h2{margin-top:0}