<h1>Icon revealing hover animation</h1>
<section>
  <button class="nav-link icono-plus"></button>
  <ul class="nav-list">
    <li class="nav-list-item"></li>
    <li class="nav-list-item"></li>
     <li class="nav-list-item"></li>
   </ul>
</section>
*, body {
  margin:0;
  padding: 0;
  background-color: #639;
  text-align: center;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
  color: #fff;
}

section {
  width: 40px;
  margin: 20px auto;
  position: relative;
}

.nav-list {
  list-style:none;
  text-align: center;
  margin-top: 12px;
  position: relative;
  display: none;
  margin-left: auto;
  margin-right: auto;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  
  &-item{
    width: 22px;
    height: 22px;
    margin: auto;
    background-color: #fff;
    margin-bottom: 8px;
    border-radius: 100%;
    
    
    &:nth-child(1) {
      transform: translateY(36px);
      animation: icon1 0.5s;
    }
    
     &:nth-child(2) {
      transform: translateY(40px);
      animation: icon2 0.5s;
    }
    
    &:nth-child(3) {
      transform: translateY(44px);
      animation: icon3 0.5s; 
    }
  }
}

.nav-link {
  font-size: 18px;
  width: 36px;
  height: 36px;
  border-radius: 100%;
  border: none;
  background-color: #000;
  color: #fff;
  z-index: 2;
  transition: ease 0.3s;
  transform: scale(1) rotate(0deg);
  cursor: pointer;
  
  &:hover {
    transition: ease 0.3s;
    transform: scale(0.9) rotate(45deg);
    
    & ~ .nav-list {
    display: block;
    }
  }

  .icono-plus {
    font-size: 16px;
    text-align: center;
  }
}

@keyframes icon1 {
  0% {
    opacity: 0;
    transform: translateY(0);
  }

  100% {
    opacity: 1;
    transform: translateY(36px);
  }
}

@keyframes icon2 {
  0% {
    opacity: 0;
    transform: translateY(0px);
  }
  30% {
    opacity: 0;
  }

  100% {
    opacity: 1;
    transform: translateY(40px);
  }
}

@keyframes icon3 {
  0% {
    opacity: 0;
    transform: translateY(0px);
  }
  
  20% {
    opacity: 0;
    transform: translateY(10px);
  }
  
  40% {
    opacity: 0;
    transform: translateY(30px);
  }

  100% {
    opacity: 1;
    transform: translateY(44px);
  }
}
View Compiled

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/icono/1.3.0/icono.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.