body{
    background:url(https://www.automationroboticscollege.com/wp-content/uploads/2021/01/Blockchain-Technology.3.jpg) fixed !important;
    -webkit-background-size: cover !important;
    -moz-background-size: cover !important;
    -o-background-size: cover !important;
    background-size: cover !important;
    backdrop-filter: blur(12px);
}
#header{
    background: url(https://ak8.picdn.net/shutterstock/videos/22048225/thumb/1.jpg) fixed !important;
}
#header .navbar-brand{
    color: lightgrey !important;
    font-size: 150%;
    font-style: italic;
    font-weight: lighter !important;
}