* {
  box-sizing: border-box;
}

body {
  background-color: #f5f5f5;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
}
img {border:0;}
header {
  background-color: #CCCCCC;
  padding: 10px;
}

header h2 {
  margin: 0;
  text-align: center;
}

#nav_menu ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  background-color: black;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

#nav_menu a {
  color: #FFFFFF;
  text-decoration: none;
  display: block;
  padding: 10px;
}

#nav_menu a:hover {
  color: #FFD700;
  text-decoration: underline;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 40px 20px;
}

.form-container {
  width: 90%;
  max-width: 500px;
  background: #ffffff;
  border: 1px solid black;
  border-radius: 5px;
  padding: 20px;
  text-align: center;
}

form {
  display: flex;
  flex-direction: column;
  align-items: center;
}

label {
  margin-top: 10px;
  font-weight: bold;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid black;
  border-radius: 3px;
  margin-top: 5px;
}

input[type="submit"] {
  width: 100%;
  padding: 10px;
  background-color: black;
  color: white;
  border: none;
  border-radius: 3px;
  font-size: 1em;
  cursor: pointer;
  margin-top: 15px;
}

input[type="submit"]:hover {
  background-color: #333;
}

footer {
  text-align: center;
  padding: 15px;
  background-color: #f5f5f5;
}

footer a {
  color: black;
  text-decoration: none;
}

@media (max-width: 600px) {
  .form-container {
    width: 95%;
  }
}