html,
    body {
        margin: 0;
        padding: 0;
        height: 100%;
        overflow-x: hidden;
    }

    body {
        background-color: #121212;
        color: #ffffff;
    }

    .background-svg {
        position: fixed;
        top: 0;
        left: 0;
        width: 200%;
        height: 200%;
        transform: translate(-25%, -25%);
        z-index: -1;
        transition: transform 4s ease;
    }

    .background-svg img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        /* filter: invert(1) grayscale(1) brightness(0.5); */
    }

    .center-section {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 1rem;
    }

    .form-container {
        max-width: 500px;
        width: 100%;
        padding: 30px;
        border-radius: 15px;
        background-color: rgba(255, 253, 253, 0.9);
        box-shadow: 0 0 25px rgba(128, 128, 128, 0.5);
        z-index: 1;
        color: #000000;
    }

    /* Estilos del avion */
    .avion {
        position: fixed;
        top: 50%;
        left: -1000px;
        width: 800px;
        height: 800px;
        transform: translateY(-50%);
        transition: left 2s ease-in-out;
        z-index: 9999;
    }

    .fade-screen {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: black;
        opacity: 0;
        transition: opacity 2s ease-in-out;
        z-index: 9998;
        pointer-events: none;
    }

    .form-control,
    .btn {
        background-color: #ffffff;
        color: #868e96;
        border: none;
    }

    .form-control::placeholder {
        color: #aaa;
    }

    @media (max-width: 768px) {

        html,
        body {
            overflow-y: auto;
        }

        .background-svg {
            width: 250%;
            height: 250%;
            transform: translate(-40%, -40%);
        }

        .center-section {
            flex-direction: column;
            padding: 2rem 1rem;
        }

        .form-container {
            padding: 25px;
            max-width: 95%;
            border-radius: 12px;
            font-size: 1.1rem;
        }

        h1.h4 {
            font-size: 1.4rem;
        }

        .form-control,
        .btn {
            font-size: 1.1rem;
            padding: 12px;
        }
    }