Filling water animation

Question

I am trying to get a wipe up animation to make a circle look like it\'s filling with water. I\'ve run into two errors, and haven\'t been able to even tackle

Answer 1

div{
  width: 200px;
  height: 200px;
  background: #ccc;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  z-index: 9;
}
div:before{
  content: '';
  position: absolute; top: 100%; left: 0;
  width: 100%;
  height: 100%;
  background: #00BFFF;  
  -webkit-animation: animtop 5s forwards, animtop2 2s forwards;
  animation: animtop 5s forwards, animtop2 2s forwards;
}
@-webkit-keyframes animtop{  
  0%{top: 100%;}  
  75%{top: 0}
}
@keyframes animtop{  
  0%{top: 100%;}  
  100%{top: 25%}
}
@-webkit-keyframes animtop2{  
  75%{top: 25%;}  
  100%{top: 0}
}
@keyframes animtop2{  
  75%{top: 25%;}  
  100%{top: 0}
}