html {
background: url("https://img4.goodfon.com/wallpaper/nbig/2/39/tokho-toukhou-devushka-fon-mech.jpg") no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
.card {
opacity: 0.9;
}
.blurry {
backdrop-filter: blur(7px) !important;
-webkit-box-shadow: 5px 5px 5px 0px rgba(0,0,0,0.75);
-moz-box-shadow: 5px 5px 5px 0px rgba(0,0,0,0.75);
box-shadow: 5px 5px 5px 0px rgba(0,0,0,0.75);
}