body {
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
    font-size: 14px;
    color: #444;
    line-height: 1.4em;
    margin: 0;
}

* {
    box-sizing: border-box;
}

a {
    text-decoration: none;
}

h1,h2,h3,h4,h5,h6,p {
    margin: 0;
}

.overlay {
    position: relative;
}
.overlay::after {
    content: '';
    background-color: #000000;
    opacity: 0.7;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;
}
.overlay * {
    z-index: 2;
}

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

.main-header {
    background-image: url(bg.jpg);
    background-attachment: scroll;
    background-position-y: 0px;
    width: 100%;
    height: 100%;
    position: fixed; 
    animation: headerLiveBG 500s linear infinite ;
}

.main-header h1 {
    background-color: rgba(255, 255, 255, 0.8);
    font-family: 'Death Note Font', sans-serif;
    font-size: clamp(1px, 10vw, 100px);
    color: #0e0e0e;
    line-height: 1;
    text-transform: uppercase;
    text-align: center;
    padding: 10px 20px;
}


@keyframes headerLiveBG {
    from {
        background-position-y: 0px;
    }
    to {
        background-position-y: 10000px;
    }
}