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HTML

              
                <h2>From left to right</h2>
<a href="#" class="btn btn-small btn-l-r">btn small</a>
<a href="#" class="btn btn-medium btn-l-r">btn medium</a>
<a href="#" class="btn btn-large btn-l-r">btn large</a>
<a href="#" class="btn btn-huge btn-l-r">btn huge</a>

<h2>From right to left</h2>
<a href="#" class="btn btn-small btn-r-l">btn small</a>
<a href="#" class="btn btn-medium btn-r-l">btn medium</a>
<a href="#" class="btn btn-large btn-r-l">btn large</a>
<a href="#" class="btn btn-huge btn-r-l">btn huge</a>

<h2>From top to bottom</h2>
<a href="#" class="btn btn-small btn-t-b">btn small</a>
<a href="#" class="btn btn-medium btn-t-b">btn medium</a>
<a href="#" class="btn btn-large btn-t-b">btn large</a>
<a href="#" class="btn btn-huge btn-t-b">btn huge</a>

<h2>From bottom to top</h2>
<a href="#" class="btn btn-small btn-b-t">btn small</a>
<a href="#" class="btn btn-medium btn-b-t">btn medium</a>
<a href="#" class="btn btn-large btn-b-t">btn large</a>
<a href="#" class="btn btn-huge btn-b-t">btn huge</a>

<h2>ِAnimated border</h2>
<a href="#" class="btn btn-small btn-animated-border">btn small</a>
<a href="#" class="btn btn-medium btn-animated-border">btn medium</a>
<a href="#" class="btn btn-large btn-animated-border">btn large</a>
<a href="#" class="btn btn-huge btn-animated-border">btn huge</a>

<h2>ِRotate top left </h2>
<a href="#" class="btn btn-small btn-rotate rotate-t-l">btn small</a>
<a href="#" class="btn btn-medium btn-rotate rotate-t-l">btn medium</a>
<a href="#" class="btn btn-large btn-rotate rotate-t-l">btn large</a>
<a href="#" class="btn btn-huge btn-rotate rotate-t-l">btn huge</a>


<h2>ِRotate top right </h2>
<a href="#" class="btn btn-small btn-rotate rotate-t-r">btn small</a>
<a href="#" class="btn btn-medium btn-rotate rotate-t-r">btn medium</a>
<a href="#" class="btn btn-large btn-rotate rotate-t-r">btn large</a>
<a href="#" class="btn btn-huge btn-rotate rotate-t-r">btn huge</a>

<h2>ِRotate bottom left </h2>
<a href="#" class="btn btn-small btn-rotate rotate-b-l">btn small</a>
<a href="#" class="btn btn-medium btn-rotate rotate-b-l">btn medium</a>
<a href="#" class="btn btn-large btn-rotate rotate-b-l">btn large</a>
<a href="#" class="btn btn-huge btn-rotate rotate-b-l">btn huge</a>

<h2>ِRotate bottom right </h2>
<a href="#" class="btn btn-small btn-rotate rotate-b-r">btn small</a>
<a href="#" class="btn btn-medium btn-rotate rotate-b-r">btn medium</a>
<a href="#" class="btn btn-large btn-rotate rotate-b-r">btn large</a>
<a href="#" class="btn btn-huge btn-rotate rotate-b-r">btn huge</a>

<h2>Shadow from bottom</h2>
<a href="#" class="btn btn-small btn-shadow">btn small</a>
<a href="#" class="btn btn-medium btn-shadow">btn small</a>
<a href="#" class="btn btn-large btn-shadow">btn small</a>
<a href="#" class="btn btn-huge btn-shadow">btn small</a>

              
            
!

CSS

              
                /**** Variables ****/
@blue: #2196F3;
@green: #4CAF50;
@pink: #E91E63;
@purple: #9C27B0;
@cyan : #00BCD4;
@teal: #009688;
@red: #F44336;
@white : #fff;
body {
  margin: 50px;
  text-align: center;
  font-family: 'Ubuntu', sans-serif; 
}
h2 {
  margin: 30px 0;
}
.btn {
  position: relative;
  background: transparent;
  display: inline-block;
  text-decoration: none;
  border: 1px solid;
  border-radius: 4px;
  margin-right: 20px;
  transition: 0.3s;
  &:after {
      content: "";
      position: absolute;
      border-radius: 4px;
      transition: 0.3s;
      z-index: -1;
      background: transparent;
  }
  &:before {
      content: "";
      position: absolute;
  }
}
/**** from left to right style ****/
.btn-l-r {
  color: @blue;
  border-color: @blue;
  &:hover {
    color: @white;
  }
  &:hover:after {
    background: @blue;
    width: 100%;
  }
  &:after {
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
  }
}

/**** from right to left style ****/
.btn-r-l {
  color: @green;
  border-color: @green;
  &:hover {
    color: @white;
  }
  &:hover:after {
    background: @green;
    width: 100%;
  }
    &:after {
      top: 0;
      right: 0;
      width: 0%;
      height: 100%;
    }
}

/**** from top to bottom style ****/
.btn-t-b {
  color: @pink;
  border-color: @pink;
  &:hover {
    color: @white;
  }
  &:hover:after {
    background: @pink;
    height: 100%;
  }
    &:after {
      top: 0;
      left: 0;
      width: 100%;
      height: 0%;
    }
}

/**** from bottom to top style ****/
.btn-b-t {
  color: @purple;
  border-color: @purple;
  &:hover {
    color: @white;
  }
  &:hover:after {
    background: @purple;
    height: 100%;
  }
    &:after {
      bottom: 0;
      left: 0;
      width: 100%;
      height: 0%;
    }
}

/**** Animated border ****/
.btn-animated-border {
  color: @cyan;
  &:hover {
    color: darken(@cyan, 10%);
  }
  &:after {
    top: -1px;
    left: 0;
    width: 0%;
    height: 100%;
    border-width: 1px 0 1px 0;
    border-style: solid;
    border-color: darken(@cyan, 10%);
  }
  &:hover:after {
    width: 100%;
  }
  &:before {
    top: 0;
    left: -1px;
    width: 100%;
    height: 0%;
    background: transparent;
    border-width: 0 1px 0 1px;
    border-style: solid;
    border-color: darken(@cyan, 10%);
    border-radius: 4px;
    transition: 0.3s;
  }
  &:hover:before {
    height: 100%;
  }
}

/**** General rotate style ****/
.btn-rotate {
  color: @teal;
  overflow: hidden;
  transition: 0.3s;
  &:after {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: @teal;
  }
  &:hover {
    color: @white;
    border-color: @teal;
  }
  &:hover:after {
    transform: rotate(0deg);
  }
}
/**** Rotate top left ****/
.rotate-t-l {
  color: @teal;
  overflow: hidden;
  transition: 0.3s;
  &:after {
    transform: rotate(-90deg);
    transform-origin: top left;
  }
}

/**** Rotate top right ****/
.rotate-t-r {
  &:after {
    transform: rotate(90deg);
    transform-origin: top right;
  }
}

/**** Rotate bottom left ****/
.rotate-b-l {
  &:after {
    transform: rotate(90deg);
    transform-origin: bottom left;
  }
  
}

/**** Rotate bottom right ****/
.rotate-b-r {
  &:after {
    transform: rotate(-90deg);
    transform-origin: bottom right;
  }
}

/**** Button Shadow from bottom ****/
.btn-shadow {
  background: @pink;
  border: none;
  color: @white;
  border-radius: 0;
  overflow: hidden;
  &:after {
    top: 100%;
    left: 0;
    z-index: 10;
    width: 100%;
    height: 100%;
    background: darken(@pink, 7%);
    border-radius: 0;
  }
  &:hover:after {
    top: 90%;
  }
}

.btn-small {
  padding: 2px 7px;
}
.btn-medium {
  padding: 7px 13px;
}
.btn-large {
  padding: 12px 18px;
}
.btn-huge {
  padding: 18px 25px;
}
              
            
!

JS

              
                
              
            
!
999px

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