CodePen Embed - Dropdown Animations with CSS Transforms

<h1>10 Dropdown Animations</h1>

<div  class="menu-container">
  <h3>Animate the Whole Menu</h3>
  <nav>
  <ul class="menu">
    <li class="dropdown dropdown-6">
      Scale Down
      <ul class="dropdown_menu dropdown_menu--animated dropdown_menu-6">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
     <li class="dropdown dropdown-7">
      RotateX
      <ul class="dropdown_menu dropdown_menu--animated dropdown_menu-7">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    <li class="dropdown dropdown-8">
      TranslateZ
      <ul class="dropdown_menu dropdown_menu--animated dropdown_menu-8">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    <li class="dropdown dropdown-9">
      Scale
      <ul class="dropdown_menu dropdown_menu--animated dropdown_menu-9">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    <li class="dropdown dropdown-10">
      Rotate Y
      <ul class="dropdown_menu dropdown_menu--animated dropdown_menu-10">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    
  </ul>
</nav>
</div>



<div class="menu-container">
  <h3>Animate Each Menu Items</h3>
<nav>
  <ul class="menu">
    <li class="dropdown dropdown-1">
      TranslateY
      <ul class="dropdown_menu dropdown_menu-1">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
     <li class="dropdown dropdown-2">
      RotateX
      <ul class="dropdown_menu dropdown_menu-2">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    <li class="dropdown dropdown-3">
      TranslateZ
      <ul class="dropdown_menu dropdown_menu-3">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    <li class="dropdown dropdown-4">
      Scale
      <ul class="dropdown_menu dropdown_menu-4">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    <li class="dropdown dropdown-5">
      TranslateX
      <ul class="dropdown_menu dropdown_menu-5">
        <li class="dropdown_item-1">Item 1</li>
        <li class="dropdown_item-2">Item 2</li>
        <li class="dropdown_item-3">Item 3</li>
          <li class="dropdown_item-4">Item 4</li>
          <li class="dropdown_item-5">Item 5</li>
      </ul>
    </li>
    
  </ul>
</nav>
</div>

@import url('https://fonts.googleapis.com/css?family=Sen&display=swap');

body
  background: #374E59
  color: #C06162
  font-family: 'Sen'
  margin-bottom: 200px
  
h1
  font-size: 48px
  text-align: center
  margin-top: 30px
  margin-bottom: 40px
  
.menu-container
    margin-top: 20px
    h3
      font-size: 24px
      margin-bottom: 10px
      text-align: center
.menu-container:nth-child(3)
    margin-top: 200px

nav 
  width: 100%
  display: flex
  justify-content: center


.menu
  display: flex
  justify-content: center

 .dropdown
   padding: 20px 40px
   display: flex
   justify-content: center
   align-items: center
   color: white
   background: #C06162
   background: #34495e
   position: relative
   font-size: 18px
   perspective: 1000px
   z-index: 100
   &:hover
     background: #2980b9 
     cursor: pointer
     
   &:hover .dropdown_menu li
     display: block
   

 .dropdown_menu
   position: absolute
   top: 100%
   left: 0
   width: 100%
   perspective: 1000px
   z-index: -1
   li
    display: none
    color: white
    background-color: #34495e
    padding: 10px 20px
    font-size: 16px
    opacity: 0
    &:hover
      background-color: #2980b9 
   


// Menu as a whole animated
.dropdown:hover .dropdown_menu--animated
    display: block
.dropdown_menu--animated
    display: none
    li
      display: block
      opacity: 1

.dropdown_menu-6
    animation: growDown 300ms ease-in-out forwards
    transform-origin: top center


@keyframes growDown {
    0% {
        transform: scaleY(0)
    }
    80% {
        transform: scaleY(1.1)
    }
    100% {
        transform: scaleY(1)
    }
}

.dropdown_menu-7
    animation: rotateMenu 400ms ease-in-out forwards
    transform-origin: top center

    
@keyframes rotateMenu {
    0% {
        transform: rotateX(-90deg)
    }
    70% {
        transform: rotateX(20deg) 
    }
    100% {
        transform: rotateX(0deg) 
    }
}



.dropdown_menu-8
    animation: downOut 300ms ease-in-out forwards
    transform-origin: center center


@keyframes downOut {
     0% {
        transform: translateZ(200px) transLateY(40px)
    }
    80% {
        transform: translateZ(-10px) transLateY(0px)
    }
    100% {
        transform: translateZ(0px) transLateY(0px)
    }
}

.dropdown_menu-9
    animation: growOut 300ms ease-in-out forwards
    transform-origin: top center

@keyframes growOut {
     0% {
        transform: scale(0)
    }
    80% {
        transform: scale(1.1)
    }
    100% {
        transform: scale(1)
    }
}

.dropdown_menu-10
    animation: rotateY 300ms ease-in-out forwards
    transform-origin: top center

@keyframes rotateY {
     0% {
        transform: rotateY(90deg)
    }
    80% {
        transform: rotateY(-10deg)
    }
    100% {
        transform: rotateY(0)
    }
}




// Menu Items Animated invidually

.dropdown_menu-1
  for num in (1..5)
     .dropdown_item-{num}
       transform-origin: top center
       animation: slideDown 300ms (num * 60ms) ease-in-out forwards
     
         
@keyframes slideDown {
  0% { 
    opacity: 0
    transform: translateY(-60px)
  }

  100% {
    opacity: 1
    transform: translateY(0)
  }
}

.dropdown_menu-2
  for num in (1..5)
     .dropdown_item-{num}  
       transform-origin: top center
       animation: rotateX 300ms (num * 60ms) ease-in-out forwards


@keyframes rotateX {
  0% {
    opacity: 0;
    transform: rotateX(-90deg);
  }
  50% {
    transform: rotateX(-20deg);
  }
  100% {
    opacity: 1;
    transform: rotateX(0deg);
  }
}

.dropdown_menu-3
  for num in (1..5)
     .dropdown_item-{num}  
       transform-origin: top center
       animation: rotateZ 300ms (num * 60ms) ease-in-out forwards


@keyframes rotateZ {
  0% {
    opacity: 0;
    transform: translateZ(290px);
  }
  
  80% {
    transform: translateZ(10px);
  }

  100% {
    opacity: 1;
    transform: translateZ(0);
  }
}

.dropdown_menu-4
  for num in (1..5)
     .dropdown_item-{num}  
       transform-origin: top center
       animation: scaleZ 300ms (num * 60ms) ease-in-out forwards


@keyframes scaleZ {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  
  80% {
    transform: scale(1.07);
  }

  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.dropdown_menu-4
  for num in (1..5)
     .dropdown_item-{num}  
       transform-origin: top center
       animation: scaleZ 300ms (num * 60ms) ease-in-out forwards


@keyframes scaleZ {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  
  80% {
    transform: scale(1.07);
  }

  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.dropdown_menu-5
  for num in (1..5)
     .dropdown_item-{num}  
       transform-origin: top center
       animation: translateX 300ms (num * 60ms) ease-in-out forwards


@keyframes translateX {
  0% {
    opacity: 0;
    transform: translateX(60px);
  }
  
  80% {
    transform: translateX(-5px);
  }

  100% {
    opacity: 1;
    transform: translateX(0px);
  }
}

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