body {    height: 100vh;    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.5)), url("../image/img_duoc.jpg");    background-size: cover;    background-position: center;}.cover-container {    max-width: 70vw;}.button-container {    display: flex;    justify-content: center;}.centered-button {    margin: 10px;    padding: 10px 20px;    background-color: #007bff;    color: #fff;    border: none;    cursor: pointer;    border-radius: 5px;}.button-container {    display: flex;    flex-wrap: wrap;    justify-content: center;}.custom-img {    margin-top: 3%;    max-width: 40%;    min-width: 200px;}/* .btn {    min-width: 250px;} */.container {    color: black;}.card {    background-color: rgba(255, 255, 255, 0.7); /* Aquí, 0.8 es la opacidad del fondo blanco */}#clave {    background-color: rgba(255, 255, 255, 0.6); /* Aquí, 0.8 es la opacidad del fondo blanco */}