body{
  font-family: Arial, sans-serif;
  background:#f5f5f5;
  margin:0;
  padding:20px;
}
header{text-align:center;margin-bottom:20px}
.card{
  background:#fff;
  padding:15px;
  margin:10px auto;
  max-width:300px;
  border-radius:10px;
  text-align:center;
}
.card img{
  max-width:100%;
  border-radius:8px;
}
a{
  display:inline-block;
  margin-top:10px;
  padding:10px 14px;
  background:#25D366;
  color:#fff;
  border-radius:8px;
  text-decoration:none;
}