nav {
    background-color: black;
    color: white;
    display: flex;
    justify-content: space-between;
    padding: 30px 60px;
}

nav ul {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

nav li {    
    list-style: none;    
}

nav li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    padding: 5px 8px;
}

nav li a:hover {
    color: yellow;
    text-decoration: none;
}

.card-header {
    background-color: #0d6efd !important;
    color: white !important;
}

.boutons {
    display: flex;
}