form {
  border: 4px solid #f1f1f1;
}


.container {
  padding: 20px;
  background-color: #f1f1f1;
}


input[type=text], input[type=submit] {
  width: 100%;
  padding: 12px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  box-sizing: border-box;
}


input[type=checkbox] {
  margin-top: 16px;
}


input[type=submit] {
  background-color: #ff0000;
  color: white;
  border: none;
}

input[type=submit]:hover {
  opacity: 0.8;
}