body {

    font-family: Arial, sans-serif;

    background: linear-gradient(to right, #4facfe, #00f2fe);

    margin: 0;

    padding: 40px;

    min-height: 100vh;

}

.contenedor {

    background-color: white;

    max-width: 900px;

    margin: auto;

    padding: 40px;

    border-radius: 15px;

    box-shadow: 0 0 20px rgba(0,0,0,0.2);

}

h1 {

    color: #2c3e50;

}

button,
input[type="button"] {

    background-color: #0077cc;

    color: white;

    border: none;

    padding: 10px 20px;

    border-radius: 8px;

    cursor: pointer;

    margin-top: 10px;

}

button:hover,
input[type="button"]:hover {

    background-color: #005fa3;

}

input[type="text"] {

    padding: 10px;

    border-radius: 8px;

    border: 1px solid #ccc;

    margin-top: 10px;

}

.oculto {

    display: none;

}

.visible {

    display: inline;

}

img {

    width: 770px;

    max-width: 100%;

    border-radius: 10px;

    margin-top: 20px;

}

/* Agregado para el ejercicio 4-6 */
.slider-shell {

    width: 900px;

    margin: auto;

    background-color: white;

    padding: 30px;

    border-radius: 20px;

    box-shadow: 0 0 20px rgba(0,0,0,0.2);

    text-align: center;

}

.slider-wrap {

    display: none;

}

.slider-wrap.active {

    display: block;

}

.slider-wrap img {

    width: 100%;

    border-radius: 15px;

    margin-top: 20px;

}

.slider-wrap h1 {

    color: #2c3e50;

}

.botones {

    margin-top: 25px;

}

.botones button {

    margin: 0 10px;

    padding: 12px 25px;

    font-size: 16px;

}