body {
    margin: 0;
    font-family: Arial, sans-serif;
}

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
}

.main-content {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.loaded .preloader {
    opacity: 0;
}

.loaded .main-content {
    opacity: 1;
}