yequari.com/static/css/winter.css

@keyframes fall {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    top: 100vh;
    opacity: 1;
  }
}

@keyframes sway {
  0% {
    margin-left: 0;
  }
  25% {
    margin-left: 50px;
  }
  50% {
    margin-left: -50px;
  }
  75% {
    margin-left: 50px;
  }
  100% {
    margin-left: 0;
  }
}


#winter {  
    z-index: -1;
    height: 100vh;
    overflow: hidden;
    position: absolute;
    top: 0;
    transition: opacity 500ms;
    width: 100%;
}

.snow {
    animation: fall ease-in infinite, sway ease-in-out infinite;
    color: skyblue;
    position: absolute;
}

.content {
    max-width: 750px;
    margin: 0 auto;
    font-size: 16px;
}

.content p {
    line-height: 1.7em;
}

.context {
    font-style: italic;
}