header {
    background-color: transparent;
    color: white;
    padding: 20px;
    text-align: center;
}
header .avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
}
@media (max-width: 768px) {
    header {
        text-align: left;
    }

    .offcanvas-body ul li {
        margin-bottom: 10px;
    }

    .btn-outline-primary {
        font-size: 0.9rem;
        padding: 8px 12px;
    }
}