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HTML

            
              <main class="wrapper">
<section class="section top">

  <header><h3 class="text-center">- Some button transitions - </h3></header>
  <div class="wrap-btns text-center">
<button class="btn  style1">Button Style 1</button>

<button class="btn  style2">Button Style 2</button>
  
<button class="btn  style3">Button Style 3</button>

</div>
</section>
<section class="section bottom">
<header><h3 class="text-center">- The Infamous Circle Button - </h3></header>
<div>
  <div id="circle-wrap">
	<a href="#" class="circle-btn">
		<div class="border-inactive"></div>
		<div class="border-active"></div>
		<div class="letter">g</div>
		<div class="underline"></div>
	</a>
  </div></div>
</section>
</main>
!

CSS

            
              @import "compass/css3";
@import url('https://fonts.googleapis.com/css?family=Quicksand:300,400,500,700|Work+Sans:100,200,400,500,600,700,900');
// Vars
$purple: #8d63db;
$violet: #5b67d5;
$gray: #f9faff;
$aqua: #00cae5;
$turquoise: #00e5c6;
$neon: #bdf030;
$dark: #464646;
$blue: #2E9FFF;
$white: #FFFFFF;
$bg: darken($gray,3%); 

$bg2: darken($gray,1%);
$oswald: 'Oswald', sans-serif;

body {
  margin: 0;
  padding: 0;
  background: $bg;
  display: table;
  width: 100%;
  height: 100%;
  min-height: 100%;
}
.wrapper {
  display: flex;
  flex-direction: column;
  text-align: center;
}
.section {
  min-height: 50vh;
  background: $bg2;
  display: flex;
  flex-direction: column;
  > * {
    flex-grow: 1;
  }
  &.top {
    border-bottom: 1px solid darken($gray,5%);
  }
  &.bottom {
    background: $bg;
  }
  header {
    display: flex;
    padding: 1rem 0;
    h3 {
      margin: auto;
    }
  }
}
.wrap-btns {
 // background: pink;
  //width: 80%;
  //margin: 20px auto 50px auto;
}

h3 {
  font-family: 'Quicksand', sans-serif;
  font-weight: normal;
  font-size: 3rem;
  letter-spacing: 7px;
  text-shadow: 1px 1px 1px #fff;
}
.btn {
   @include border-radius(0);
   @include transition(all .2s linear);
   padding-top: 0;
   padding-bottom: 0;
   width: 230px;
   margin: 0 10px 10px;
  
   font: 300 14px/50px $oswald;
   letter-spacing: .4em;
   text-transform: uppercase;
  
   border: 3px solid $aqua;
   background: $aqua;
   color: darken($white, 2%);
   
    &.style1 {
     position: relative;
     z-index:1;
     &:before {
       position: absolute;
       content: '';
       top: 50%;
       left: 50%;
       height: 0;
       width: 0;
       border-radius: 50%;
       background: $bg2;
       z-index: -1;
       @include transform(translate(-50%, -50%));
       @include transition(width .3s, height .2s ease-in-out, border-radius .1s linear .05s);
	   }
      &:hover {
        color: $violet;
        border-color: $violet;
      }
      &:hover:before {
        width: 100%;
        height: 100%;
        border-radius: 0;
        color: $violet;
		 }
   } /* .style1 */
  
   &.style2 {
     background: darken($aqua,4%);
     border-color: darken($aqua,4%);
     @include transition(background .15s linear, border-color .35s ease-out, border-radius .25s ease-out, letter-spacing .2 ease-in, color .2s);
     &:hover,
     &:active {
       border-radius: 34px;
       background: transparent;
       //letter-spacing: .35em;
       color: $purple;
       border-color: $purple;
     }
   } /* .style2 */
  
   &.style3 {
     @include transition(color .3s);
     position: relative;
     background: transparent;
     z-index: 1;
     background: darken($aqua,8%);
     border-color: darken($aqua,8%);
     &:after {
       position: absolute;
       content: '';
       border-style: solid;
       border-color: $bg;
       border-width: 0;
       width: 100%;
       height: 100%;
       top: 0;
       left: 0;
       padding: 2px;
       z-index: -1;
       background: darken($aqua,8%);
     
       @include transition(transform .2s, opacity .2s, border-width .2s);
     }
     &:hover:after {
       /* @include transform(scale(0.96, 0.85)); */
       border-width: 4px;
     }
   } /* .style3 */
  
   &:hover,
   &:active {
      color: $white;
  }
}


/* CIRCLE BUTTON */

#circle-wrap {
  width: 102px;
  height: 102px;
  margin: 0 auto 50px;
  text-align: center;
  top: 0;
  position: relative;
  cursor: pointer;
  display: block;
  @include backface-visibility(hidden);
  @include transform(translate(-2px,20px) translateZ(0) translate3d(0,0,0));
  @include transform-style(preserve-3d);
  a {
    text-decoration: none!important;
    background: magenta;
  }
}


.border-inactive {
	height: 100px;
	width: 100px;
  position: absolute;
  //opacity: .3;
  border: 6px solid $violet;
  @include border-radius(50%);
  @include transition(all 700ms cubic-bezier(0.23,1,.32,1) .08s);
  @include transform-style(preserve-3d);

	a:hover & {
    opacity: 0;
    border: 2px solid $violet;
    @include transform(scale(1.3) translateZ(0) translate3d(0,0,0));
    @include transition(all 400ms cubic-bezier(0.23,1,.32,1));
	}
}

.border-active {
  height: 112px;
  width: 112px;
  margin: -57px 0 0 -57px;
  position: absolute;
  opacity: 0;
  top: 50%;
  left: 50%;
  border: 10px solid $aqua;
  @include border-radius(50%);
  @include transition(all 400ms cubic-bezier(0.23,1,.32,1));
  @include transform-style(preserve-3d);
  @include transform(scale(.8) translateZ(0) translate3d(0,0,0));
  a:hover & {
    opacity: 1;
    background: $aqua;
    @include transform(scale(1) translateZ(0) translate3d(0,0,0));
    @include transition(all 700ms cubic-bezier(0.23,1,.32,1) .03s);
  }
}

.letter {
  font: 60px/45px $oswald;
  color: $violet;
  //opacity: .4;
  position: relative;
  @include transform(translate(1px,5px) translateZ(0) translate3d(0,0,0));
  @include transform-style(preserve-3d);
  @include transition(all 500ms cubic-bezier(0.23,1,.32,1));
  a:hover & {
    @include transform(translate(1px,1px) translateZ(0) translate3d(0,0,0));
    @include transition(all 700ms cubic-bezier(0.23,1,.32,1));
    opacity: 1;
    //color: $dark;
    color: darken($violet,2%);
  }
}

.underline {
  height: 7px;
width: 31px;
  @include transform(translate(1px,30px) translateZ(0) translate3d(0,0,0));
  @include transform-style(preserve-3d);
  @include transition(all 500ms cubic-bezier(0.23,1,.32,1));

  position: relative;
  margin: 0 auto;
background: $violet;
//opacity: .4;

  a:hover & {
    @include transform(translate(1px,35px) translateZ(0) translate3d(0,0,0));
    @include transition(all 700ms cubic-bezier(0.23,1,.32,1));
    opacity: 1;
   // background: $dark;
  background: darken($violet,2%);
  }
}
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