Creating a CSS blinking eyelid effect

Question

I am trying to create a wait/countdown screen that shows an eye along with the eyelid, and eyeball with an iris effect. Given that so many of us spend time pointlessly star

Answer 1

I would do this differently and consider rotation for the blink effect. The trick is to create the eye with two elements (the eyelid) to be able to blink it.

Here is the code with only the blink animation:

.eye {
  width: 250px;
  height: 80px;
  margin: 50px;
  display:inline-block;
  perspective: 200px;
  background:
    radial-gradient(circle 100px at 50% 250%,#f1c27d 99% ,transparent 100%) top/100% 50%,
    radial-gradient(circle 100px at 50% -150%,#f1c27d 99% ,transparent 100%) bottom/100% 50%;
  background-repeat:no-repeat
}

.eye>div {
  height: 50%;
  position:relative;
  overflow:hidden;
  transform-origin:bottom;
  animation:b1 0.8s  infinite ease-out alternate;
}
.eye>div:last-child {
  transform-origin:top;
  animation-name:b2;
}
.eye>div:before {
  content: "";
  position: absolute;
  top:0;
  left:10%;
  right:10%;
  padding-top:80%;
  border-radius:50%;
  background:#fff;
  box-shadow:
    -2px 0 0 3px inset #f1c27d,
    inset -5px 5px 2px 4px black;
}
.eye>div:last-child:before {
  bottom:0;
  top:auto;
  box-shadow:
    -2px 0 0 3px inset #f1c27d,
    inset -6px -4px 2px 4px black;
}


body {
 background:#000;
}

@keyframes b1{
  to { transform:rotateX(-88deg);}
}
@keyframes b2{
  to {transform:rotateX(88deg);}
}

Here is a more realistic blinking with a full eye:

var ticks = 300,ticker;
setTimeout(function() { ticker = setInterval(changeTick,1600);},500);

function changeTick()
{
 document.querySelector('.eye span').setAttribute('data-text', --ticks);
 if (0 === ticks) clearInterval(ticker);
}

.eye {
  width: 250px;
  height: 80px;
  margin: 50px;
  display:inline-block;
  perspective: 200px;
  background:
    radial-gradient(circle 100px at 50% 250%,#f1c27d 99% ,transparent 100%) top/100% 50%,
    radial-gradient(circle 100px at 50% -150%,#f1c27d 99% ,transparent 100%) bottom/100% 50%;
  background-repeat:no-repeat;
  transform-style:preserve-3d;
  position:relative;
}

.eye>div {
  height: 50%;
  position:relative;
  overflow:hidden;
  transform-origin:bottom;
  z-index:1;
  animation:b1 0.8s  infinite ease-out alternate;
}
.eye>div:last-child {
  transform-origin:top;
  animation:none;
}
.eye>div:before {
  content: "";
  position: absolute;
  top:0;
  left:10%;
  right:10%;
  padding-top:80%;
  border-radius:50%;
  background:#fff;
  box-shadow:
    -2px 0 0 3px inset #f1c27d,
    inset -5px 5px 2px 4px black;
  animation:inherit;
  animation-name:color;
}
.eye>div:last-child:before {
  bottom:0;
  top:auto;
  box-shadow:
    -2px 0 0 3px inset #f1c27d,
    inset -6px -4px 2px 4px black;
}
.eye > span {
  position:absolute;
  width:45px;
  height:45px;
  bottom:18px;
  left:50%;
  transform:translateX(-50%) translateZ(55px);
  overflow:hidden;
  border-radius:20% 20% 0 0;
  z-index:2;
  animation:b2 0.8s  infinite ease-out alternate;
}
.eye > span:before {
  position:absolute;
  left:0;
  bottom:0;
  height:45px;
  width:100%;
  content:attr(data-text);
  border-radius:50%;
  background:#000;
  color:#fff;
  text-align:center;
  line-height:45px;
}


body {
 background:#000;
}

@keyframes b1{
  to { 
    transform:rotateX(-170deg);
  }
}
@keyframes b2{
  50% {
    height:20px;
  }
  60%,100% {
    height:0px;
  }
}
@keyframes color{
  0%,40% {
    background:#fff;
    box-shadow:
      -2px 0 0 3px inset #f1c27d,
      inset -5px 5px 2px 4px black;
  }
  40.1%,100% { 
    background:#f1c27d;
    box-shadow:none;
  }
}