css动画效果
.css_animation{ height:50px; 50px; border-radius: 25px; background: rgba(255, 0, 0, 0.9); transform: scale(0); animation: myfirst 3s; animation-iteration-count: infinite; } @keyframes myfirst{ to{ transform: scale(2); background: rgba(0, 0, 0, 0); } }