body {
  background-image: url('path-to-your-texture-image.jpg');
  background-repeat: repeat;
  background-size: auto; /* Or cover depending on the image size */
}body {
  background-color: #fdfdfd;
  background-image: 
    radial-gradient(#d3d3d3 1px, transparent 1px),
    radial-gradient(#d3d3d3 1px, transparent 1px);
  background-size: 50px 50px;
  background-position: 0 0, 25px 25px;
  background-blend-mode: normal;
}.noise-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none; /* Allows clicking through it */
  opacity: 0.05; /* Very subtle */
  background-image: url('your-texture.jpg');
  mix-blend-mode: multiply; /* Or overlay */
}