body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.header {
  width: 100%;  
  color: white;
  text-shadow: 3px 1px #333;
  text-align: center;
  padding: 20px;
  background-image: url("../bandeau-off.png");
}

.headeron {
  width: 100%;  
  color: white;
  text-shadow: 3px 1px #333;
  text-align: center;
  padding: 20px;
  background-image: url("../bandeau-on.png");
}

.header p, .headeron p {
  text-align: right;
  padding-right: 100px;
}


.menu {
  color: #ccc;
  background-color: #333;
  overflow: hidden;
  width: 100%;
  text-align: center;
}
.menu a {
  color: white;
  text-decoration: none;
  padding: 14px 20px;
  display: inline-block;
}
.menu a:hover {
  background-color: #ddd;
  color: black;
}
.form-container {
  background: white;
  padding: 20px;
  margin-top: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  width: 600px;
}
.form-container h2 {
  text-align: center;
  margin-bottom: 20px;
}
.form-container label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
}
.form-container input, .form-container select {
  width: 100%;
  padding: 10px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 4px;
}
.form-container button {
  width: 100%;
  padding: 10px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
}
.form-container button:hover {
  background-color: #45a049;
}
.form-container .calc-container {
  display: flex;
  align-items: center;
  gap: 10px;
}
.form-container .calc-container input,
.form-container .calc-container select,
.form-container .calc-container button {
  width: auto;
  flex: 1;
  padding: 10px;
  margin: 0;
}