Do you want your site to have snow?

If you would like a bit of holiday snow on your site use the following code in code header injection under website tools. It will snow gently on every page as seen here: my random views

<style>
/* customizable snowflake styling */
.snowflake {
  color: #fff;
  font-size: 1em;
  font-family: Arial, sans-serif;
  text-shadow: 0 0 5px #000;
}

@-webkit-keyframes snowflakes-fall{0%{top:-10%}100%{top:100%}}@-webkit-keyframes snowflakes-shake{0%,100%{-webkit-transform:translateX(0);transform:translateX(0)}50%{-webkit-transform:translateX(80px);transform:translateX(80px)}}@keyframes snowflakes-fall{0%{top:-10%}100%{top:100%}}@keyframes snowflakes-shake{0%,100%{transform:translateX(0)}50%{transform:translateX(80px)}}.snowflake{position:fixed;top:-10%;z-index:9999;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;cursor:default;-webkit-animation-name:snowflakes-fall,snowflakes-shake;-webkit-animation-duration:10s,3s;-webkit-animation-timing-function:linear,ease-in-out;-webkit-animation-iteration-count:infinite,infinite;-webkit-animation-play-state:running,running;animation-name:snowflakes-fall,snowflakes-shake;animation-duration:10s,3s;animation-timing-function:linear,ease-in-out;animation-iteration-count:infinite,infinite;animation-play-state:running,running}.snowflake:nth-of-type(0){left:1%;-webkit-animation-delay:0s,0s;animation-delay:0s,0s}.snowflake:nth-of-type(1){left:10%;-webkit-animation-delay:1s,1s;animation-delay:1s,1s}.snowflake:nth-of-type(2){left:20%;-webkit-animation-delay:6s,.5s;animation-delay:6s,.5s}.snowflake:nth-of-type(3){left:30%;-webkit-animation-delay:4s,2s;animation-delay:4s,2s}.snowflake:nth-of-type(4){left:40%;-webkit-animation-delay:2s,2s;animation-delay:2s,2s}.snowflake:nth-of-type(5){left:50%;-webkit-animation-delay:8s,3s;animation-delay:8s,3s}.snowflake:nth-of-type(6){left:60%;-webkit-animation-delay:6s,2s;animation-delay:6s,2s}.snowflake:nth-of-type(7){left:70%;-webkit-animation-delay:2.5s,1s;animation-delay:2.5s,1s}.snowflake:nth-of-type(8){left:80%;-webkit-animation-delay:1s,0s;animation-delay:1s,0s}.snowflake:nth-of-type(9){left:90%;-webkit-animation-delay:3s,1.5s;animation-delay:3s,1.5s}.snowflake:nth-of-type(10){left:25%;-webkit-animation-delay:2s,0s;animation-delay:2s,0s}.snowflake:nth-of-type(11){left:65%;-webkit-animation-delay:4s,2.5s;animation-delay:4s,2.5s}
</style>
<div class="snowflakes" aria-hidden="true">
  <div class="snowflake">
  ❅
  </div>
  <div class="snowflake">
  ❆
  </div>
  <div class="snowflake">
  ❅
  </div>
  <div class="snowflake">
  ❆
  </div>
  <div class="snowflake">
  ❅
  </div>
  <div class="snowflake">
  ❆
  </div>
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❆
  </div>
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❆
  </div>
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❆
  </div>
</div>

To ensure the site remains accessible, don’t forget to include a way for visitors to disable the moving elements 🙂. A button that hides the elements with the snowflake class should work. 

I moved the CSS to the home page header code injection and used a markdown block on one summary bloc page ( https://myrandomviews.com/blogsummary/iawl ) from site-wide code injection. I decided the snowflakes were a bit distracting when reading a blog post. The markdown block in a blog post also changes any page that has a summary item with content from that post as well as seen here:   https://myrandomviews.com/blogsummary

If it helps, here's some additional code to add a button that hides the flakes like this:

<style>
.floating-button {
  position: fixed;
  bottom: 70px;
  right: 20px;
  width: 34px;
  height: 34px;
  background-color: rgba(0,0,0,0.5);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.play-icon:before {
  content: "\25B6"; /* Unicode for Play icon */
  font-size: 16px;
  color: white;
}

.pause-icon:before {
  content: "\275A\275A"; /* Unicode for Pause icon */
  font-size: 16px;
  color: white;
}
</style>

<!-- Floating button -->
  <div id="toggleButton" class="floating-button" onclick="toggleSnowflakes()">
    <span id="buttonIcon" class="pause-icon"></span>
  </div>

<script>
var isSnowflakesVisible = true;
var buttonIcon = document.getElementById('buttonIcon');

function toggleSnowflakes() {
  var snowflakes = document.querySelectorAll('.snowflake');

  snowflakes.forEach(function (snowflake) {
    snowflake.style.display = isSnowflakesVisible ? 'none' : 'block';
  });

  // Toggle the button icon
  buttonIcon.className = isSnowflakesVisible ? 'play-icon' : 'pause-icon';

  // Toggle the state
  isSnowflakesVisible = !isSnowflakesVisible;
}  
</script>

I will certainly give your code a try.