每日计划 - html+css作品 : CSS3动画实现钟摆效果

#container{ transition:all 3s;  margin:-20px auto; width:1px; height: 500px; 
                    animation: around 8s infinite ease;}
　　#line{width: 1px; height: 360px; background-color: #BBB; margin: auto;}
 　 #ball{width: 60px; margin-left:-30px; height:60px; background-color:#D2691E ; border-radius:15px;}
                @keyframes  around{
                    0% {transform: rotate(38deg ); transform-origin: top;}
                    50% {transform: rotate(-38deg);  transform-origin: top}
                    100%{transform: rotate(38deg); transform-origin: top}
                }



<div id="container">
            <div id="line"></div>
            <div id="ball"></div>    
</div>