body {
            margin: 0;
            font-family: Arial, sans-serif;
        }

header {
    margin-left: 150px;
    padding: 30px 20px;
    background : linear-gradient(90deg, #2980b9, #6dd5fa, #00b894);
    color: rgb(46, 39, 39);
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 2em;
}

header p {
    margin: 5px 0 0 0;
    font-size: 1.2em;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

nav li {
    margin: 0;
}

nav a {
    display: block;
    padding: 12px 20px;
    color: white;
    text-decoration: none;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #130f44;
}

nav ul ul {
    background-color: #6dd5fa;
}

nav ul ul li a {
    padding-left: 40px;
    font-size: 0.95em;
}  
nav {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh; /* Hauteur totale de l'écran */
    width: 150px;   /* Largeur du menu */
    background-color: #2980b9;
    padding-top: 20px;
    overflow-y: auto;
}  
nav img {
    width: 100%;
    height: auto;
    display: block;
} 
       
       
       
        main {
            margin-left: 150px;
            background-color: #cdf5f7;
            padding: 20px;
        }

        footer {

            margin-left: 150px;
            padding: 20px;
            background-color: #2980b9;
            text-align: center;
        }

        h1, h2 {
            margin-top: 0;
        }
table {
  width: 80%;
  border-collapse: collapse;
  margin: 20px auto;
  font-family: Arial, sans-serif;
}

th, td {
  border: 1px solid #333;
  padding: 10px;
  text-align: center;
}

th {
  background-color: #4CAF50;
  color: white;
}

tr:nth-child(e