CSS

css code to blur background

/* Setting background image and filter to blur */
body{
      background-image: url("software_code_3.jpg");
      background-position: center;
      background-repeat: no-repeat;
      background-size: cover;
      background-attachment: fixed;
      color: whitesmoke;
      backdrop-filter: blur(8px);
/*       -webkit-filter: blur(8px); */
    }
/* creating a kind of "glass-polymorphism" effect with a light-dark background*/
.container {
      border: 1px;
      border-radius: 5px;
      background-color: rgb(0,0,0);
      background-color: rgba(0,0,0, 0.4);
      padding: 20px;
    }

css background transparent blur

backdrop-filter: blur(10px);

transparent blur effect css

body {
    background: #300000;
    background: linear-gradient(45deg, #300000, #000000, #300000, #000000);
    color: white;
}
#mask {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: black;
    opacity: 0.5;
}
img {
    filter: blur(10px);
    -webkit-filter: blur(10px);
    -moz-filter: blur(10px);
  -o-filter: blur(10px);
  -ms-filter: blur(10px);
    position: absolute;
    left: 100px;
    top: 100px;
    height: 300px;
    width: auto;
}