body {
    margin: 0;
    padding: 0;
    /* overflow: hidden;  <-- REMOVE OR COMMENT THIS OUT */
}

#snowCanvas {
    position: fixed; /* Changed from absolute to fixed */
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1; /* Puts the snow behind your content */
    pointer-events: none; /* Allows you to click/scroll through the snow */
}