body{
  margin:0;
  font-family:Arial, sans-serif;
  background:#f3f5f7;
}
.back{
  display:inline-block;
  margin:16px 20px 0;
  text-decoration:none;
  color:#1d4ed8;
}
.back:active{color:#111827;background:#fde047;border-radius:8px;padding:2px 6px;}
h1{margin:14px 20px 20px;font-size:28px;}
.menu{margin:0 20px 20px;}
.menu__list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  gap:10px;
}
.menu__link{
  display:block;
  padding:12px 16px;
  background:#1f2937;
  color:#fff;
  text-decoration:none;
  border-radius:10px;
  transition:0.15s;
}
.menu__link:hover{background:#111827;}
.menu__link:active{background:#fde047;color:#111827;}
.menu__link:focus{outline:3px solid #60a5fa;outline-offset:2px;}