button {
    margin: 10px 0px 10px 0px;
    outline: none;
  }
  .custom-btn {
    width: 130px;
    height: 40px;
    padding: 10px 25px;
    border: 2px solid #000;
    font-size:medium;
    font-family: 'Lato', sans-serif;
    font-weight: 500;
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    display: inline-block;
  }
  
  /* 1 */
  .btn-1 {
    transition: all 0.3s ease;
  }
  .btn-1:hover {
     box-shadow:
     -7px -7px 20px 0px #fff9,
     -4px -4px 5px 0px #fff9,
     7px 7px 20px 0px #0002,
     4px 4px 5px 0px #0001;
  }
  
  /* 2 */
  .btn-2 {
    
  }
  .btn-2:after {
    position: absolute;
    content: "";
    top: 5px;
    left: 6px;
    width: 90%;
    height: 70%;
    border: 1px solid #000;
    opacity: 0;
    transition: all 0.3s ease;
  }
  .btn-2:hover:after {
    opacity: 1;
  }
  
  
  /* 3 */
  .btn-3 {
    line-height: 39px;
    padding: 0;
  }
  .btn-3:hover{
    background: transparent;
    color: #000;
  }
  .btn-3 span {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
  }
  .btn-3:before,
  .btn-3:after {
    position: absolute;
    content: "";
    left: 0;
    top: 0;
    background: #000;
    transition: all 0.3s ease;
  }
  .btn-3:before {
    height: 0%;
    width: 2px;
  }
  .btn-3:after {
    width: 0%;
    height: 2px;
  }
  .btn-3:hover:before {
    height: 100%;
  }
  .btn-3:hover:after {
    width: 100%;
  }
  .btn-3 span:before,
  .btn-3 span:after {
    position: absolute;
    content: "";
    right: 0;
    bottom: 0;
    background: #000;
    transition: all 0.3s ease;
  }
  .btn-3 span:before {
    width: 2px;
    height: 0%;
  }
  .btn-3 span:after {
    width: 0%;
    height: 2px;
  }
  .btn-3 span:hover:before {
    height: 100%;
  }
  .btn-3 span:hover:after {
    width: 100%;
  }
  
  /* 4 */
  .btn-4 {
    position: relative;
    color: #000;
    z-index: 2;
    line-height: 40px;
    padding: 0;
  }
  .btn-4:hover{
    border: none;
  }
  .btn-4:before,
  .btn-4:after {
    position: absolute;
    content: "";
    width: 0%;
    height: 0%;
    border: 2px solid;
    z-index: -1;
    transition: all 0.3s ease;
  }
  .btn-4:before {
    top: 0;
     left: 0;
     border-bottom-color: transparent;
     border-right-color: transparent;
     border-top-color: #000;
     border-left-color: #000;
  }
  .btn-4:after{
     bottom: 0;
     right: 0;
     border-top-color: transparent;
     border-left-color: transparent;
     border-bottom-color: #000;
     border-right-color: #000;
  }
  .btn-4:hover:before,
  .btn-4:hover:after {
    border-color: #000;
    height: 100%;
    width: 100%;
  }
  
  
  
  /* 5 */
  .btn-5 {
    background: #000;
    color: #fff;
    line-height: 42px;
    padding: 0;
    border: none;
  }
  .btn-5:hover {
    background: transparent;
    color: #000;
     box-shadow:
     -7px -7px 20px 0px #fff9,
     -4px -4px 5px 0px #fff9,
     7px 7px 20px 0px #0002,
     4px 4px 5px 0px #0001;
  }
  .btn-5:before,
  .btn-5:after{
    content:'';
    position:absolute;
    top:0;
    right:0;
    height:2px;
    width:0;
    background: #000;
    transition:400ms ease all;
  }
  .btn-5:after{
    right:inherit;
    top:inherit;
    left:0;
    bottom:0;
  }
  .btn-5:hover:before,
  .btn-5:hover:after{
    width:100%;
    transition:800ms ease all;
  }
  
  
  /* 6 */
  .btn-6 {
     background: #000;
    color: #fff;
    line-height: 42px;
    padding: 0;
    border: none;
  }
  .btn-6 span {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
  }
  .btn-6:before,
  .btn-6:after {
    position: absolute;
    content: "";
    height: 0%;
    width: 2px;
    background: #000;
  }
  .btn-6:before {
    right: 0;
    top: 0;
    transition: all 500ms ease;
  }
  .btn-6:after {
    left: 0;
    bottom: 0;
    transition: all 500ms ease;
  }
  .btn-6:hover{
    color: #000;
    background: transparent;
  }
  .btn-6:hover:before {
    transition: all 500ms ease;
    height: 100%;
  }
  .btn-6:hover:after {
    transition: all 500ms ease;
    height: 100%;
  }
  .btn-6 span:before,
  .btn-6 span:after {
    position: absolute;
    content: "";
    background: #000;
  }
  .btn-6 span:before {
    left: 0;
    top: 0;
    width: 0%;
    height: 2px;
    transition: all 500ms ease;
  }
  .btn-6 span:after {
    right: 0;
    bottom: 0;
    width: 0%;
    height: 2px;
    transition: all 500ms ease;
  }
  .btn-6 span:hover:before {
    width: 100%;
  }
  .btn-6 span:hover:after {
    width: 100%;
  }
  
  /* 7 */
  .btn-7 {
     background: #000;
    color: #fff;
    line-height: 42px;
    padding: 0;
    border: none;
    z-index: 1;
     -webkit-transition: all 0.3s linear;
      transition: all 0.3s linear;
  }
  .btn-7:hover {
    background: transparent;
    color: #000;
  }
  .btn-7:before,
  .btn-7:after {
    position: absolute;
    content: "";
    left: 0;
    width: 100%;
    height: 50%;
    right: 0;
    z-index: -1;
    background: #000;
    transition: all 0.3s ease;
  }
  .btn-7:before {
    top: 0;
  }
  .btn-7:after {
    bottom: 0;
  }
  .btn-7:hover:before,
  .btn-7:hover:after {
    height: 0;
    background-color: #000;
  }
  
  
  
  
  /* 8 */
  .btn-8 {
     line-height: 40px;
    padding: 0;
    background: transparent;
    position: relative;
    z-index: 2;
    color: #fff;
    -webkit-perspective: 300px;
    perspective: 300px;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
  }
  .btn-8:hover{
    color: #000;
  }
  .btn-8:after {
    position: absolute;
    content: "";
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    z-index: -1;
    -webkit-transform-origin: center bottom;
    transform-origin: center bottom;
    -webkit-transform: rotateX(0);
    transform: rotateX(0);
    transition: all 0.3s ease;
  }
  .btn-8:hover:after {
    -webkit-transform: rotateX(-180deg);
    transform: rotateX(-180deg);
  }
    
  
  /* 9 */
  .btn-9 {
    z-index: 2;
    transition: all 0.3s ease;
    overflow: hidden;
  }
  .btn-9:after {
    position: absolute;
    content: " ";
    z-index: -1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: all 0.3s ease;
  }
  .btn-9:hover {
    box-shadow:  4px 4px 6px 0 rgba(255,255,255,.5),
                -4px -4px 6px 0 rgba(116, 125, 136, .2), 
      inset -4px -4px 6px 0 rgba(255,255,255,.5),
      inset 4px 4px 6px 0 rgba(116, 125, 136, .3);
    color: #fff;
  }
  .btn-9:hover:after {
    -webkit-transform: scale(2) rotate(180deg);
    transform: scale(2) rotate(180deg);
    background: #000;
    box-shadow:  4px 4px 6px 0 rgba(255,255,255,.5),
                -4px -4px 6px 0 rgba(116, 125, 136, .2), 
      inset -4px -4px 6px 0 rgba(255,255,255,.5),
      inset 4px 4px 6px 0 rgba(116, 125, 136, .3);
  }
  
  /* 10 */
  .btn-10 {
    transition: all 0.3s ease;
    overflow: hidden;
  }
  .btn-10:after {
    position: absolute;
    content: " ";
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    transition: all 0.3s ease;
    -webkit-transform: scale(.1);
    transform: scale(.1);
  }
  .btn-10:hover {
    color: #fff;
  }
  .btn-10:hover:after {
    background: #000;
    -webkit-transform: scale(1);
    transform: scale(1);
  }
  
  /* 11 */
  .btn-11 {
    overflow: hidden;
    transition: all 0.3s ease;
  }
  .btn-11:hover {
     background: #000;
    color: #fff;
  }
  .btn-11:before {
      position: absolute;
      content: '';
      display: inline-block;
      top: -180px;
      left: 0;
      width: 30px;
      height: 100%;
      background-color: #fff;
      animation: shiny-btn1 3s ease-in-out infinite;
  }
  .btn-11:active{
    box-shadow:  4px 4px 6px 0 rgba(255,255,255,.3),
                -4px -4px 6px 0 rgba(116, 125, 136, .2), 
      inset -4px -4px 6px 0 rgba(255,255,255,.2),
      inset 4px 4px 6px 0 rgba(0, 0, 0, .2);
  }
  
  
  @-webkit-keyframes shiny-btn1 {
      0% { -webkit-transform: scale(0) rotate(45deg); opacity: 0; }
      80% { -webkit-transform: scale(0) rotate(45deg); opacity: 0.5; }
      81% { -webkit-transform: scale(4) rotate(45deg); opacity: 1; }
      100% { -webkit-transform: scale(50) rotate(45deg); opacity: 0; }
  }
  
  
  /* 12 */
  .btn-12{
    position: relative;
    right: 20px;
    bottom: 20px;
    border:none;
    width: 130px;
    height: 40px;
    line-height: 40px;
    -webkit-perspective: 230px;
    perspective: 230px;
  }
  .btn-12 span {
    display: block;
    position: absolute;
    width: 130px;
    height: 40px;
    border: 2px solid #000;
    margin:0;
    text-align: center;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-transition: all .3s;
    transition: all .3s;
  }
  .btn-12 span:nth-child(1) {
    box-shadow:
     -7px -7px 20px 0px #fff9,
     -4px -4px 5px 0px #fff9,
     7px 7px 20px 0px #0002,
     4px 4px 5px 0px #0001;
    -webkit-transform: rotateX(90deg);
    -moz-transform: rotateX(90deg);
    transform: rotateX(90deg);
    -webkit-transform-origin: 50% 50% -20px;
    -moz-transform-origin: 50% 50% -20px;
    transform-origin: 50% 50% -20px;
  }
  .btn-12 span:nth-child(2) {
    -webkit-transform: rotateX(0deg);
    -moz-transform: rotateX(0deg);
    transform: rotateX(0deg);
    -webkit-transform-origin: 50% 50% -20px;
    -moz-transform-origin: 50% 50% -20px;
    transform-origin: 50% 50% -20px;
  }
  .btn-12:hover span:nth-child(1) {
    -webkit-transform: rotateX(0deg);
    -moz-transform: rotateX(0deg);
    transform: rotateX(0deg);
  }
  .btn-12:hover span:nth-child(2) {
    background: #e0e5ec;
    color: #e0e5ec;
    -webkit-transform: rotateX(-90deg);
    -moz-transform: rotateX(-90deg);
    transform: rotateX(-90deg);
  }
  
  
  /* 13 */
  .btn-13 {
     background: #000;
    color: #fff;
    z-index: 1;
  }
  .btn-13:after {
    position: absolute;
    content: "";
    width: 100%;
    height: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
     background: #e0e5ec;
    transition: all 0.3s ease;
  }
  .btn-13:hover {
    color: #000;
  }
  .btn-13:hover:after {
    top: 0;
    height: 100%;
  }
  .btn-13:active {
    top: 2px;
  }
  
  
  /* 14 */
  .btn-14 {
     background: #000;
    color: #fff;
    z-index: 1;
  }
  .btn-14:after {
    position: absolute;
    content: "";
    width: 100%;
    height: 0;
    top: 0;
    left: 0;
    z-index: -1;
    background: #e0e5ec;
    transition: all 0.3s ease;
  }
  .btn-14:hover {
    color: #000;
  }
  .btn-14:hover:after {
    top: auto;
    bottom: 0;
    height: 100%;
  }
  .btn-14:active {
    top: 2px;
  }
  
  /* 15 */
  .btn-15 {
     background: #000;
    color: #fff;
    z-index: 1;
  }
  .btn-15:after {
    position: absolute;
    content: "";
    width: 0;
    height: 100%;
    top: 0;
    right: 0;
    z-index: -1;
     background: #e0e5ec;
    transition: all 0.3s ease;
  }
  .btn-15:hover {
    color: #000;
  }
  .btn-15:hover:after {
    left: 0;
    width: 100%;
  }
  .btn-15:active {
    top: 2px;
  }
  
  
  /* 16 */
  .btn-16 {
     background: #000;
    color: #fff;
    z-index: 1;
  }
  .btn-16:after {
    position: absolute;
    content: "";
    width: 0;
    height: 100%;
    top: 0;
    left: 0;
    direction: rtl;
    z-index: -1;
    background: #e0e5ec;
    transition: all 0.3s ease;
  }
  .btn-16:hover {
    color: #000;
  }
  .btn-16:hover:after {
    left: auto;
    right: 0;
    width: 100%;
  }
  .btn-16:active {
    top: 2px;
  }