html,body{height:100%}
.bg_heart{position:relative;top:0;left:0;width:100%;height:100%;overflow:hidden}

.heart{position:absolute;top:-50%;-webkit-transform:rotate(-45deg);-moz-transform:rotate(-45deg);-m-transform:rotate(-45deg);transform:rotate(-45deg)}
.heart:before{position:absolute;top:-50%;left:0;display:block;content:"";width:100%;height:100%;background:inherit;border-radius:100%;}
.heart:after{position:absolute;top:0;right:-50%;display:block;content:"";width:100%;height:100%;background:inherit;border-radius:100%;}

@-webkit-keyframes love {
  0%{top:110%}
}
@-moz-keyframes love {
  0%{top:110%}
}
@-ms-keyframes love {
  0%{top:110%}
}
@keyframes love {
  0%{top:110%}
}