Pulsing Heart CSS animation

Question

I`m working on an animated heart only with CSS.

I want it to pulse 2 times, take a small break, and then repeat it again.

What I have now:

sm         


        

Answer 1

body{
  margin: 0;
  padding: 0;
  background: #1f1f1f;
}

body:before
{
  position: absolute;
  content: '';
  left: 50%;
  width: 50%;
  height: 100%;
  background: rgba(0,0,0,.2);

}

.center
{
  position: absolute;
  top:50%;
  left: 50%;
  background: #1f1f1f;
  transform: translate(-50%,-50%);
  padding: 100px;
  border: 5px solid white;
  border-radius: 100%;
  box-shadow:20px 20px 45px rgba(0,0,0,.4);
  z-index: 1;
  overflow: hidden;
}
.heart
{
  position: relative;
  width: 100px;
  height: 100px;
  background:#ff0036;
  transform: rotate(45deg) translate(10px,10px);
  animation: ani 1s linear infinite;
}
.heart:before
{
  content: '';
  width: 100%;
  height: 100%;
  background: #ff0036;
  position: absolute;
  top:-50%;
  left:0;
  border-radius: 50%;
}
.heart:after
{
  content:'';
  width: 100%;
  height: 100%;
  background: #ff0036;
  position: absolute;
  bottom:0;
  right:50%;
  border-radius: 50%;
}
.center:before
{
  content: '';
  position: absolute;
  top:0;
  left:-50%;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,.3);
}

@keyframes ani{
  0%{
    transform: rotate(45deg) translate(10px,10px) scale(1);
  }
  25%{
    transform: rotate(45deg) translate(10px,10px) scale(1);
  }
  30%{
    transform: rotate(45deg) translate(10px,10px) scale(1.4);
  }
  50%{
    transform: rotate(45deg) translate(10px,10px) scale(1.2);
  }
  70%{
    transform: rotate(45deg) translate(10px,10px) scale(1.4);
  }
  90%{
    transform: rotate(45deg) translate(10px,10px) scale(1);
  }
  100%{
    transform: rotate(45deg) translate(10px,10px) scale(1);
  }
}

Output

for more: Heart Beating Animation