.banner{
        margin-top: 60px;
        height: 700px;
    }
    
    .main-btn {
        width: 250px;
        height: 70px;
    }
    
    .bd-placeholder-img {
        font-size: 1.125rem;
        text-anchor: middle;
        -webkit-user-select: none;
        -moz-user-select: none;
        user-select: none;
    }

    @media (min-width: 768px) {
        .bd-placeholder-img-lg {
        font-size: 3.5rem;
        }
    }

    #avatar {
        width: 150px;
        height: 150px;
    }

    .card {
        transition: transform 0.3s ease-in-out;
    }

    .card:hover {
        transform: scale(1.05);
    }