HTML部分：

<div class="content">
    <div class="left"></div>
    <div class="right"></div>
</div>

CSS部分：

                .content{
				width:300px;
				height:300px;
				margin:0 auto;
				position:relative;
				animation-name: dump;
				animation-delay: 0ms;
				animation-duration: 1s;
				animation-timing-function: ease-in-out;
				animation-iteration-count: infinite;
			}

			.content .left,.content .right{
				position:absolute;
				width:150px;
				height:240px;
				background:red;
				filter: drop-shadow(0 0 20px rgb(255,20,20));
				border-radius:75px 75px 0 0;
			}
			.content .left{
				transform: rotate(-45deg);
			}
			.content .right{
				transform: rotate(45deg);
				left:64px;
			}
			@keyframes dump{
				0%{
					transform: scale(0.8,0.8);
					opacity: 1;
				}
				30%{
					transform: scale(1,1);
					opacity: 0.8;
				}
				100%{
					transform: scale(0.8,0.8);
					opacity: 1;
				}
			}