<style>
.t557__snow-layer {
position: fixed;
height: 100vh;
z-index: 1;
}
</style>
<div class="snow-block">
<div class="t557__snow-layer" style="opacity: 1;"></div>
</div>
<style>
.snow-block {
position: fixed;
z-index: 1;
top: 0;
width: 100%;
height:100vh;
}
</style>