body, html {
    height: 100%;
    margin: 0;
    font-family: Arial, sans-serif;
    color: white;
    text-align: center;
    background: url('image/20210306_160444.jpg') no-repeat center center fixed;
    background-size: cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.logo {
    max-width: 200px;
    margin-bottom: 20px;
}

.slogan {
    font-size: 2.5rem;
    font-weight: bold;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
}