<section>
  <button class="nav-link">
    <span class="icono-plus nav-icon"></span>
      <ul class="nav-list">
    <li class="nav-list-item"><span class="icono-facebook">Facebook</span></li>
    <li class="nav-list-item"><span class="icono-instagram"></span></li>
     <li class="nav-list-item">
       <span class="icono-twitter"></span>
     </li>
   </ul>
  </button>
</section>

*, body {
  margin:0;
  padding: 0;
  box-sizing: border-box;
  background-color: black;
  text-align: center;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
  color: #fff;
}

body {
  display:flex;
  justfify-contetn: center;
  align-items: center;
  height: 100vh;
}

section {
  margin: auto;
  position: relative;
}

.nav-list {
  list-style:none;
  text-align: center;
  display: none;
  margin-left: auto;
  margin-right: auto;
  position: absolute;
  top: 16px;
  left: 0px;
  right: 0;
 background: transparent;
  
  &-item{
    width: 42px;
    height: 42px;
    margin: auto;
    background-color: #2936cd;
    color: white;
    margin-bottom: 8px;
    border-radius: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    
    &:hover {
      background-color: #051196;
    }
        
    > span {
      transform: scale(0.8);
      background-color: transparent; //only for icon render issue fix
    }
    
    
    &: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: 42px;
  height: 42px;
  border-radius: 100%;
  border: none;
  background-color: #2936cd;
  color: #fff;
  z-index: 2;
  transition: ease 0.3s;
  cursor: pointer;
  
  > .nav-icon  {
    transition: ease 0.3s;
    transform: scale(1) rotate(0);
  }
  
  &:hover {
    transition: ease 0.3s;
    
    > .nav-icon {
     transition: ease 0.3s;
     transform: scale(0.9) rotate(45deg);
    }
    
    & .nav-list {
      display: block;
    }
  }

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

.nav-icon {
 background:transparent;
}

@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);
  }
}