.animation-bulle>a{position:relative;z-index:2;overflow:hidden}.animation-bulle>a:before{content:"";width:500px;height:500px;background-color:#fff;position:absolute;left:calc(50% - 250px);top:calc(50% - 250px);border-radius:50%;z-index:-1;transform:scale(0);transition:.3s ease-in-out all}.animation-bulle>a:hover:before{background-color:#000;transform:scale(.5)}a{color:orange}