body{font:17px/1.65 system-ui,sans-serif;color:#24323b;background:#f5f7f8;margin:0}header,main,footer{max-width:850px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;gap:20px}header>a{font-size:24px;font-weight:700}nav{display:flex;gap:20px}a{color:#17694c}main{background:white;border-radius:12px}h1{line-height:1.15}h2{font-size:21px;margin-top:28px}footer{font-size:14px}@media(max-width:540px){header{display:block}nav{margin-top:12px}main{border-radius:0}}