[CSS]下にスクロールしろという案内をふわふわアニメートするCSS

<p class="scroll-announce">下にスクロールしてね</p>body { background: #000; color: #fff; min-height: 1000px;}.scroll-announce { text-align: center; position: relative;}.scroll-announce:after { font-size: 40px; font-weight: bold; display: block; text-align: center; content: "↓"; position: absolute; left: 50%; left: calc( 50% - 24px ); bottom: -100px; width: 48px; animation: scroll-announce 3s ease infinite;}@keyframes scroll-announce { 0% { transform:translateY(0) } 70% { transform:translateY(-15px) } 100% { transform:translateY(0) }}