body{
  font-family: Arial, sans-serif;
  margin:0;
  background:#f5f5f5;
}
.container{
  max-width:800px;
  margin:80px auto;
  background:white;
  padding:2rem;
  border-radius:12px;
  box-shadow:0 2px 10px rgba(0,0,0,.08);
}
button{
  padding:.75rem 1rem;
  cursor:pointer;
}