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HTML 

              
                <body>
  <div class="wrapper">
    <h2> button style 1 </h2>
    <a href="#" class="btn">
    Button
  </a> <a href="#" class="btn">
    Button
  </a>
     <a href="#" class="btn">
    Button
  </a>
    <br>
<!--  Button 2 -->
    <h2> button style 2 </h2>
   <a href="#" class="btn2">
    Button 2
  </a>
    <a href="#" class="btn2">
    Button 2
  </a>
    <a href="#" class="btn2">
    Button 2
  </a>
  <!--  Button 3 -->
    <h2> button style 3 </h2>
   <a href="#" class="btn3">
    Button 3
  </a>
    <a href="#" class="btn3">
    Button 3
  </a>
    <a href="#" class="btn3">
    Button 3
  </a>
<!--  Button 4 -->
     <h2> button style 4 </h2>
   <a href="#" class="btn4">
    Button 4
  </a>
    <a href="#" class="btn4">
    Button 4
  </a>
    <a href="#" class="btn4">
    Button 4
  </a>
<!--  Button 5 -->
  <h2> button style 5 </h2>
   <a href="#" class="btn5">
    Button 5
  </a>
    <a href="#" class="btn5">
    Button 5
  </a>
    <a href="#" class="btn5">
    Button 5
  </a>
<!--  Button 6 -->
    <h2> button style 6 </h2>
   <a href="#" class="btn6">
    Button 6
  </a>
    <a href="#" class="btn6">
    Button 6
  </a>
    <a href="#" class="btn6">
    Button 6
  </a>
<!--  Button 7 -->
     <h2> button style 7 </h2>
   <a href="#" class="btn7">
    Button 7
  </a>
    <a href="#" class="btn7">
    Button 7
  </a>
    <a href="#" class="btn7">
    Button 7
  </a>
<!--  Button 8 -->
    <h2> Button style 8</h2>
<a href="#0" class="bar-anchor">
     <span>button 8</span>
  <div class="transition-bar"></div>
</a>
    <a href="#0" class="bar-anchor">
     <span>button 8</span>
  <div class="transition-bar"></div>
</a>
   <a href="#0" class="bar-anchor">
     <span>button 8</span>
  <div class="transition-bar"></div>
</a>
<!--  Button 9 -->
<h2> Button style 9</h2>
<a href="#0" class="btn9">
     <span>button 9</span>
  <div class="transition"></div>
</a>
    <a href="#0" class="btn9">
     <span>button 9</span>
  <div class="transition"></div>
</a>
   <a href="#0" class="btn9">
     <span>button 9</span>
  <div class="transition"></div>
</a>
<!--  Button 10 -->
    <h2> Button style 10</h2>
<a href="#0" class="btn10">
     <span>button 10</span>
  <div class="transition"></div>
</a>
    <a href="#0" class="btn10">
     <span>button 10</span>
  <div class="transition"></div>
</a>
   <a href="#0" class="btn10">
     <span>button 10</span>
  <div class="transition"></div>
</a>
<!--  Button 10 -->
    <h2> Button style 11</h2>
<a href="#0" class="btn11">
     <span>button 11</span>
  <div class="transition"></div>
</a>
    <a href="#0" class="btn11">
     <span>button 11</span>
  <div class="transition"></div>
</a>
   <a href="#0" class="btn11">
     <span>button 11</span>
  <div class="transition"></div>
</a>
     <h2> Button style 12</h2>
  <a href="#0" class="button12">
   <em> </em>   
    <span>
      Button 12
      </span>
  </a>
    <a href="#0" class="button12">
   <em></em>   
    <span>
      Button 12
      </span>
  </a>
<a href="#0" class="button12">
   <em> </em>   
    <span>
      Button 12
      </span>
  </a>


  </div>
</body>
!

CSS 

              
                body {
  background: #00002E;
  color:#6098FF;
  font-family:sans-serif;
  font-size:16px;
}
h2{
  font-size:14px;
  text-transform:uppercase;
  letter-spacing:3px;
  margin-top: 70px;
  margin-bottom:20px;
}


/* Wrapper Is not Needed| Just for demo purpose.  */
.wrapper {
  margin: 150px auto;
  text-align: center;
  width: 100%;
  position: relative;
}

.btn, .btn2, .btn3, .btn4, .btn5, .btn6, .btn7, .btn10{
  padding: 15px 100px;
  margin:10px 4px;
  color: #fff;
  font-family: sans-serif;
  text-transform: uppercase;
  text-align: center;
  position: relative;
  text-decoration: none;
  display:inline-block;
  
}

.btn::before {
  content: '';
  position: absolute;
  bottom: 50%;
  left: 0px;
  width: 100%;
  height: 1px;
  background: #6098FF;
  display: block;
  -webkit-transform-origin: left top;
  -ms-transform-origin: left top;
  transform-origin: left top;
  -webkit-transform: scale(0, 1);
  -ms-transform: scale(0, 1);
  transform: scale(0, 1);
  -webkit-transition: transform 0.4s cubic-bezier(1, 0, 0, 1);
  transition: transform 0.4s cubic-bezier(1, 0, 0, 1)
}

.btn:hover::before {
  -webkit-transform-origin: right top;
  -ms-transform-origin: right top;
  transform-origin: right top;
  -webkit-transform: scale(1, 1);
  -ms-transform: scale(1, 1);
  transform: scale(1, 1)
}

/*======= Button 2 =======*/
.btn2::before{
  content: "";
position: absolute;
top: 0;
left: 0;
display: block;
width: 100%;
height: 100%;
z-index: -1;
background-color: #000;
-webkit-transform: scaleY(.3);
transform: scaleY(.3);
opacity: 0;
transition: all .3s
}

.btn2:hover{
  color:#6098FF;  
}
.btn2:hover::before{
  opacity: 1;
  background-color: #fff;
  -webkit-transform: scaleY(1);
  transform: scaleY(1);
  transition: -webkit-transform .6s cubic-bezier(.08, .35, .13, 1.02), opacity .4s;
  transition: transform .6s cubic-bezier(.08, .35, .13, 1.02), opacity
}
/*======= Button 3 =======*/
.btn3::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-color: #000;
  -webkit-transform: scaleX(.3);
  transform: scaleX(.3);
  opacity: 0;
  transition: all .3s
}
.btn3:hover::before{
  opacity: 1;
  background-color: #6098FF;
  -webkit-transform: scaleX(1);
  transform: scaleX(1);
  transition: -webkit-transform .6s cubic-bezier(.08, .35, .13, 1.02), opacity .4s;
  transition: transform .6s cubic-bezier(.08, .35, .13, 1.02), opacity
}
/*======= Button 4 =======*/
.btn4::before {
  content: '';
  position: absolute;
  bottom: 0%;
  left: 0px;
  width: 100%;
  height: 1px;
  background: #6098FF;
  display: block;
  -webkit-transform-origin: right top;
  -ms-transform-origin: right top;
  transform-origin: right top;
  -webkit-transform: scale(0, 1);
  -ms-transform: scale(0, 1);
  transform: scale(0, 1);
  -webkit-transition: transform 0.4s cubic-bezier(1, 0, 0, 1);
  transition: transform 0.4s cubic-bezier(1, 0, 0, 1)
}

.btn4:hover::before {
  -webkit-transform-origin: left top;
  -ms-transform-origin: left top;
  transform-origin: left top;
  -webkit-transform: scale(1, 1);
  -ms-transform: scale(1, 1);
  transform: scale(1, 1)
}

/*=======Button 5============= */
.btn5{
  border:none;
}
.btn5::before {
  content: '';
  position: absolute;
  left: 0px;
  bottom:0px;
  z-index:-1;
  width: 100%;
  height:100%;
  background: transparent;
  box-shadow: inset 0px 0px 0px #6098FF;
  display: block;
  -webkit-transition: all 0.4s cubic-bezier(.5, .24, 0, 1);
  transition: all 0.4s cubic-bezier(.5, .24, 0, 1)
}
/* if you want it to show from the right use -300px instead */
.btn5:hover::before {
 box-shadow: inset 300px 0px 0px #6098FF;
}

/*=======Button 6============= */
.btn6{
  border:1px solid transparent; 
   -webkit-transition: all 0.4s cubic-bezier(.5, .24, 0, 1);
  transition: all 0.4s cubic-bezier(.5, .24, 0, 1);
}

.btn6::before {
  content: '';
  position: absolute;
  left: 0px;
  bottom:0px;
  z-index:-1;
  width: 0%;
  height:1px;
  background: #6098FF;
  box-shadow: inset 0px 0px 0px #6098FF;
  display: block;
  -webkit-transition: all 0.4s cubic-bezier(.5, .24, 0, 1);
  transition: all 0.4s cubic-bezier(.5, .24, 0, 1)
}

.btn6:hover::before {
  width:100%;
}

.btn6::after {
  content: '';
  position: absolute;
  right: 0px;
  top:0px;
  z-index:-1;
  width: 0%;
  height:1px;
  background: #6098FF;
  -webkit-transition: all 0.4s cubic-bezier(.5, .24, 0, 1);
  transition: all 0.4s cubic-bezier(.5, .24, 0, 1)
}
.btn6:hover::after {
  width:100%;
}
.btn6:hover{
  border-left:1px solid #6098FF;
  border-right:1px solid #6098FF;
}
/* button7 */


.btn7 {
    box-shadow: inset 000px 0px 0px 0px #6098FF;
  -webkit-transition: all 0.6s cubic-bezier(.9, .24, .40, 1);
  transition: all 0.6s cubic-bezier(.9, .24, .40, 1)
}

.btn7::before {
    content: '';
    width: 100%;
    height: 0%;
    display: block;
    background: #80ffd3;
    position: absolute;
    left: 0%;
    opacity: 0;
    top: 0;
    z-index: -1;
    -webkit-transition: height .4s cubic-bezier(0.9, 1, 0.32, 1), opacity .1s ease;
    transition: height .4s cubic-bezier(0.9, 1, 0.32, 1), opacity .1s ease;
  
}

.btn7:hover::before {
    opacity: 1;
    height: 100%;
}

.btn7:hover {
    box-shadow: inset 00px 100px 0px 0px #6098FF;
    color: #ffffff;
}
.bar-anchor{
  padding: 20px 10px;
  margin:10px 4px;
  color: #fff;
  font-family: sans-serif;
  text-transform: uppercase;
  text-align: center;
  position: relative;
  text-decoration: none;
  display:inline-block;
   overflow:hidden;
/*    border:1px solid #6098FF; */
}
.bar-anchor span{
  background:#00002E;
  width:100%;
  position:relative;
  padding:10px 70px;
   -moz-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  -o-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
/*   border:1px solid #6098FF;  */
}
.transition-bar{
    position: absolute;
    top: 0;
    left: 0%;
    width: 0;
    height: 100%;
    background: #80ffd3;
    z-index:-1;
/*     -ms-transform: skewX(-20deg); 
    -webkit-transform: skewX(-20deg); 
    transform: skewX(-20deg); */
}
.bar-anchor:hover span{
  color: #80ffd3!important;
}
.bar-anchor:hover .transition-bar{
  width:120%;
  left:110%;
  -moz-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  -o-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
}
/* Button 9 */
.btn9{
  padding: 20px 10px;
  margin:10px 4px;
  color: #fff;
  font-family: sans-serif;
  text-transform: uppercase;
  text-align: center;
  position: relative;
  text-decoration: none;
  display:inline-block;
   overflow:hidden;
/*    border:1px solid #6098FF; */
}
.btn9 span{
  background:#00002E;
  width:100%;
  position:relative;
  padding:10px 70px;
   -moz-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  -o-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
/*   border:1px solid #6098FF;  */
}
.transition{
    position: absolute;
    top: -10%;
    left: 0%;
    width: 100%;
    height: 0%;
    background: #80ffd3;
    z-index:-1;
/*     -ms-transform: skewX(-50deg); 
    -webkit-transform: skewX(-50deg); 
    transform: skewX(-50deg); */
}
.btn9:hover span{
  color: #80ffd3!important;
}
.btn9:hover .transition{
  height:100%;
  top:101%;
  -moz-transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
  -o-transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
  transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
}
/* Btn 10  */
.btn10{
    top: 40px;
    font-family: "proxima-nova", sans-serif;
    font-weight: 500;
    font-size: 13px;
    text-transform: uppercase!important;
    letter-spacing: 2px;
    color: #fff;
    cursor: hand;
    text-align: center;
    text-transform: capitalize;
    border: 1px solid #fff;
    border-radius:50px;
    position: relative;
    overflow: hidden!important;
    -webkit-transition: all .3s ease-in-out;
    -moz-transition: all .3s ease-in-out;
    -o-transition: all .3s ease-in-out;
    transition: all .3s ease-in-out;
    background: transparent!important;
    z-index:10;
    
}


.btn10:hover{
    border: 1px solid #071982;
	  color: #80ffd3!important;
}
.btn10::before {
    content: '';
    width: 0%;
    height: 100%;
    display: block;
    background: #071982;
    position: absolute;
	  -ms-transform: skewX(-20deg);
    -webkit-transform: skewX(-20deg); 
    transform: skewX(-20deg);   
    left: -10%;
    opacity: 1;
    top: 0;
    z-index: -12;
    -moz-transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
  -o-transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
  transition: all .7s cubic-bezier(0.77, 0, 0.175, 1);
	   box-shadow:2px 0px 14px rgba(0,0,0,.6);
  } 

.btn10::after {
    content: '';
    width: 0%;
    height: 100%;
    display: block;
    background: #80ffd3;
    position: absolute;
	-ms-transform: skewX(-20deg);
    -webkit-transform: skewX(-20deg); 
    transform: skewX(-20deg);   
    left: -10%;
    opacity: 0;
    top: 0;
    z-index: -15;
    -webkit-transition: all .94s cubic-bezier(.2,.95,.57,.99);
    -moz-transition: all .4s cubic-bezier(.2,.95,.57,.99);
    -o-transition: all .4s cubic-bezier(.2,.95,.57,.99);
    transition: all .4s cubic-bezier(.2,.95,.57,.99);
    box-shadow: 2px 0px 14px rgba(0,0,0,.6);
}
.btn10:hover::before, .btn1O:hover::before{
	opacity:1;
	width: 116%;
}
.btn10:hover::after, .btn1O:hover::after{
	opacity:1;
	width: 120%;
}

/* Btn 11  */
.btn11{
    top: 40px;
    padding:20px 90px;
    margin: 0 10px;
    display: inline-block;
    text-decoration:none;
    font-family: "proxima-nova", sans-serif;
    font-weight: 500;
    font-size: 13px;
    text-transform: uppercase!important;
    letter-spacing: 2px;
    color: #fff;
    cursor: hand;
    text-align: center;
    text-transform: capitalize;
    border-radius:0px;
    position: relative;
    overflow: hidden!important;
    -webkit-transition: all .3s ease-in-out;
    -moz-transition: all .3s ease-in-out;
    -o-transition: all .3s ease-in-out;
    transition: all .3s ease-in-out;
    background: transparent!important;
}


.btn11:hover{
    border: 1px solid #transparent;
	  color: #80ffd3!important;
}
.btn11::before {
    content: '';
    width: 100%;
    height: 100%;
    display: block;
    background: #c10daf;
    position: absolute;  
    left: 0%;
    opacity: 1;
    top: 0;
    z-index: -12;
    -webkit-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
       -moz-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
         -o-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
            transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
  } 

.btn11::after {
    content: '';
    width: 100%;
    height: 100%;
    display: block;
    background: #80ffd3;
    position: absolute;
    left: 0%;
    opacity: 1;
    top: 0;
    z-index: -15;
    -webkit-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
       -moz-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
         -o-transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
            transition: all .65s cubic-bezier(0.77, 0, 0.175, 1);
}
.btn11:hover::before, .btn11:hover::before{
	opacity:1;
  	-webkit-transform: translateX(100%);
	     -moz-transform: translateX(100%);
	      -ms-transform: translateX(100%);
	          transform: translateX(100%);
}
.btn11:hover::after, .btn11:hover::after{
	opacity:1;
    -webkit-transform: translateX(-100%);
	     -moz-transform: translateX(-100%);
	      -ms-transform: translateX(-100%);
	          transform: translateX(-100%);
}


/* Btn 12 */

.button12 {
  cursor: pointer;
  background-color: #000;
  width: 330px;
  height: 64px;
  padding:20px 50px;
  line-height: 64px;
  position: relative;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  z-index: 0;
  background:#9A8A62;
  margin-left:20px;
}
.button12 span {
  color: #fff;
  display: inline-block;
  padding-left: 35px;
  text-transform: uppercase;
  font: bold 18px/66px Arial;
  transform: scaleX(0.6);
  letter-spacing: 3px;
  transform-origin: center left;
  transition: color 0.3s ease;
  position: relative;
  z-index: 1;
}
.button12 em {
  position: absolute;
  height: 1px;
  background: #fff;
  width: 47%;
  right: 23px;
  top: 50%;
  transform: scaleX(0.25);
   -webkit-transform:scaleX(0.25);
  transform-origin: center right;
  transition: all 0.3s ease;
  z-index: 1;
}
.button12:before,
.button12:after {
  content: '';
  background: #fff;
  height: 50%;
  width: 0;
  position: absolute;
  transition: 0.3s cubic-bezier(0.785, 0.135, 0.15, 0.86);
  -webkit-transition:0.3s cubic-bezier(0.785, 0.135, 0.15, 0.86);
}
.button12:before {
  top: 0;
  left: 0;
  right: auto;
}
.button12:after {
  bottom: 0;
  right: 0;
  left: auto;
}
.button12:hover:before {
  width: 100%;
  right: 0;
  left: auto;
}
.button12:hover:after {
  width: 100%;
  left: 0;
  right: auto;
}
.button12:hover span {
  color: #000;
}
.button12:hover em {
  background: #000;
  transform: scaleX(.51);
  transform: scaleX(.51);
}
!

JS
!
999px

Console