body {
  font-family: sans-serif;
  background-color: #f9f9f9;
  margin: 10px;
}

header {
  text-align: center;
  width: 100%;
}
footer {
  text-align: center; 
}
.btn {
  padding: 12px;
  background-color: #0066cc;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  margin-top: 10px;
}

.btn:hover {
  background-color: #0052a3;
}
.hidden {
  display: none !important;
}
#show_form_btn {
  display: block;
  margin: 20px auto;
}