*{box-sizing:border-box}
body{font-family:system-ui,sans-serif;width:min(760px,calc(100% - 48px));margin:60px auto;padding:0;color:#1a1a1a;line-height:1.7}
h1{font-size:28px;margin-bottom:8px}
h2{font-size:18px;margin-top:40px;margin-bottom:8px}
p{color:#374151;margin-bottom:12px}
a{color:#FF8C00}
.back{display:inline-block;margin-bottom:40px;color:#FF8C00;text-decoration:none;font-weight:600}

@media(max-width:640px){
  body{width:calc(100% - 32px);margin:32px auto}
}