body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: Arial, sans-serif;
}

.overlay {
    background: url('background.jpg') no-repeat center center fixed;
    background-size: cover;
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

.logo-container {
    position: relative;
    z-index: 2;
}

.logo {
    max-width: 100%;
    height: auto;
}