header {
  text-align: center;
  margin-bottom: 20px;
}

#ex1 {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px;
  max-width: 400px;
  margin: auto;
}

h1,
h2 {
  color: #333;
}

label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
}

input[type="text"] {
  width: calc(100% - 22px);
  padding: 10px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

input[type="button"],
input[type="reset"] {
  background-color: #28a745;
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 10px;
}

input[type="button"]:hover,
input[type="reset"]:hover {
  background-color: #218838;
}

p {
  margin-top: 15px;
  font-size: 16px;
  color: #555;
}