css动画

css动画效果

.css_animation{  
        height:50px;  
        width: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);  
            }  
        }