html, body {
    height: 100%;
    width: 100%;
    background-color: black;
    background-image: var(--background-img);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
}

.center {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

/* Circular Loader */
.loader {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top: 5px solid var(--loader-color); /* Color dinámico */
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    100% {
        transform: rotate(360deg);
    }
}