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

header {
    background-color: #2171ea;
    color: #fff;
    padding: 20px;
    text-align: center;
}

#bienvenue {
    animation: anim-bienvenue 2s infinite;
}

@keyframes anim-bienvenue {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

    body {
        font-family: Arial, sans-serif;
        background-color: #f9f9f9;
        margin: 0;
        padding: 20px;
    }
    
    .tabs {
        margin-bottom: 20px;
    }
    
    .tab-button {
        background-color: #ffc400;
        color: white;
        border: none;
        padding: 10px 20px;
        margin: 0 5px;
        cursor: pointer;
        border-radius: 5px;
        transition: background-color 0.3s ease;
    }
    
    .tab-button:hover {
        background-color: #ff7b00;
    }
    
    .tab-button.active {
        background-color: #ffc400;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }
    
    .content {
        padding: 20px;
        background-color: white;
        border-radius: 5px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }