style.css

/* http://codepen.io/supah/pen/OMdPpW */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  font-family: 'Open sans', sans-serif;
}

body {
  background: -webkit-linear-gradient(40deg, #f3c680, #a1e3e2);
  background: linear-gradient(50deg, #f3c680, #a1e3e2);
}

/*--------------------
Buttons
--------------------*/
.btn {
  display: block;
  background: #bded7d;
  color: white;
  text-decoration: none;
  margin: 20px 0;
  padding: 15px 15px;
  border-radius: 5px;
  position: relative;
}
.btn::after {
  content: '';
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transition: all .2s ease-in-out;
  transition: all .2s ease-in-out;
  box-shadow: inset 0 3px 0 transparent, 0 3px 3px rgba(0, 0, 0, 0.2);
  border-radius: 5px;
}
.btn:hover::after {
  background: rgba(0, 0, 0, 0.1);
  box-shadow: inset 0 3px 0 rgba(0, 0, 0, 0.2);
}

/*--------------------
Form
--------------------*/
.form fieldset {
  border: none;
  padding: 0;
  padding: 10px 0;
  position: relative;
  clear: both;
}
.form fieldset.fieldset-expiration {
  float: left;
  width: 60%;
}
.form fieldset.fieldset-expiration .select {
  width: 84px;
  margin-right: 12px;
  float: left;
}
.form fieldset.fieldset-ccv {
  clear: none;
  float: right;
  width: 86px;
}
.form fieldset label {
  display: block;
  text-transform: uppercase;
  font-size: 11px;
  color: rgba(0, 0, 0, 0.6);
  margin-bottom: 5px;
  font-weight: bold;
  font-family: Inconsolata;
}
.form fieldset input,
.form fieldset .select {
  width: 100%;
  height: 38px;
  color: #333333;
  padding: 10px;
  border-radius: 5px;
  font-size: 15px;
  outline: none !important;
  border: 1px solid rgba(0, 0, 0, 0.3);
  box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.2);
}
.form fieldset input.input-card-number,
.form fieldset .select.input-card-number {
  width: 82px;
  display: inline-block;
  margin-right: 8px;
}
.form fieldset input.input-card-number:last-child,
.form fieldset .select.input-card-number:last-child {
  margin-right: 0;
}
.form fieldset .select {
  position: relative;
}
.form fieldset .select::after {
  content: '';
  border-top: 8px solid #222;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  position: absolute;
  z-index: 2;
  top: 14px;
  right: 10px;
  pointer-events: none;
}
.form fieldset .select select {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  position: absolute;
  padding: 0;
  border: none;
  width: 100%;
  outline: none !important;
  top: 6px;
  left: 6px;
  background: none;
}
.form fieldset .select select :-moz-focusring {
  color: transparent;
  text-shadow: 0 0 0 #000;
}
.form button {
  width: 100%;
  height: 38px;
  outline: none !important;
  background: -webkit-linear-gradient(270deg, #49a09b, #3d8291);
  background: linear-gradient(180deg, #49a09b, #3d8291);
  text-transform: uppercase;
  font-size: 1rem;
  font-weight: bold;
  border: none;
  box-shadow: none;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  margin-top: 90px;
  padding: 0 15px;
}
.form button .fa {
  margin-right: 6px;
}

/*--------------------
Checkout
--------------------*/
.checkout {
  margin: 150px auto 30px;
  position: relative;
  width: 460px;
  background: white;
  border-radius: 15px;
  padding: 160px 45px 30px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.debug {
  display: block;
  width: 460px;
  background: rgba(0,0,0,0.15);
  border-radius: 15px;
  margin: auto;
  padding: 30px 45px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  font-family: monospace;
  opacity: 0;
  transition: opacity .6s ease-out;
}
.debug.active {
  opacity: 1;
}


/*--------------------
Credit Card
--------------------*/
.credit-card-box {
  -webkit-perspective: 1000;
          perspective: 1000;
  width: 400px;
  height: 280px;
  position: absolute;
  top: -112px;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
}
.credit-card-box:hover .flip, .credit-card-box.hover .flip {
  -webkit-transform: rotateY(180deg);
          transform: rotateY(180deg);
}
.credit-card-box .front,
.credit-card-box .back {
  width: 400px;
  height: 250px;
  border-radius: 15px;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  background: -webkit-linear-gradient(315deg, #bd6772, #53223f);
  background: linear-gradient(135deg, #bd6772, #53223f);
  position: absolute;
  color: #fff;
  font-family: Inconsolata;
  top: 0;
  left: 0;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.3);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
}
.credit-card-box .front::before,
.credit-card-box .back::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: url("http://cdn.flaticon.com/svg/44/44386.svg") no-repeat center;
  background-size: cover;
  opacity: .05;
}
.credit-card-box .flip {
  -webkit-transition: 0.6s;
  transition: 0.6s;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  position: relative;
}
.credit-card-box .logo {
  position: absolute;
  top: 9px;
  right: 20px;
  width: 60px;
}
.credit-card-box .logo img {
  -webkit-filter: invert(1);
          filter: invert(1);
  width: 100%;
  height: auto;
}
.credit-card-box .front {
  z-index: 2;
  -webkit-transform: rotateY(0deg);
          transform: rotateY(0deg);
}
.credit-card-box .back {
  -webkit-transform: rotateY(180deg);
          transform: rotateY(180deg);
}
.credit-card-box .back .logo {
  top: 185px;
}
.credit-card-box .chip {
  position: absolute;
  width: 60px;
  height: 45px;
  top: 20px;
  left: 20px;
  background: -webkit-linear-gradient(315deg, #ddccf0 0%, #d1e9f5 44%, #f8ece7 100%);
  background: linear-gradient(135deg, #ddccf0 0%, #d1e9f5 44%, #f8ece7 100%);
  border-radius: 8px;
}
.credit-card-box .chip::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  border: 4px solid rgba(128, 128, 128, 0.1);
  width: 80%;
  height: 70%;
  border-radius: 5px;
}
.credit-card-box .strip {
  background: -webkit-linear-gradient(315deg, #404040, #1a1a1a);
  background: linear-gradient(135deg, #404040, #1a1a1a);
  position: absolute;
  width: 100%;
  height: 50px;
  top: 30px;
  left: 0;
}
.credit-card-box .number {
  position: absolute;
  margin: 0 auto;
  top: 103px;
  left: 19px;
  font-size: 38px;
}
.credit-card-box label {
  font-size: 10px;
  letter-spacing: 1px;
  text-shadow: none;
  text-transform: uppercase;
  font-weight: normal;
  opacity: 0.5;
  display: block;
  margin-bottom: 3px;
}
.credit-card-box .card-holder,
.credit-card-box .card-expiration-date {
  position: absolute;
  margin: 0 auto;
  top: 180px;
  left: 19px;
  font-size: 22px;
  text-transform: capitalize;
}
.credit-card-box .card-expiration-date {
  text-align: right;
  left: auto;
  right: 20px;
}
.credit-card-box .ccv {
  height: 36px;
  background: #fff;
  width: 91%;
  border-radius: 5px;
  top: 110px;
  left: 0;
  right: 0;
  position: absolute;
  margin: 0 auto;
  color: #000;
  text-align: right;
  padding: 10px;
}
.credit-card-box .ccv label {
  margin: -25px 0 14px;
  color: #fff;
}


/* SUCCESS and ERROR */

.modalbox.success,
.modalbox.error {
  margin-top: 15%;
  padding: 25px 25px 50px;
  text-align: center;
}
.modalbox.success.animate .icon,
.modalbox.error.animate .icon {
  -webkit-animation: fall-in 0.75s;
  animation: fall-in 0.75s;
}
.modalbox.success h1,
.modalbox.error h1 {
  font-family: 'Montserrat', sans-serif;
}
.modalbox.success p,
.modalbox.error p {
  font-family: 'Open Sans', sans-serif;
}
.modalbox.success .icon,
.modalbox.error .icon {
  position: relative;
  margin: 0 auto;
  margin-top: -75px;
  height: 100px;
  width: 100px;
  border-radius: 50%;
}
.modalbox .icon > i {
  color: white;
  font-size: 5rem;
  margin-top: .5rem;
}
.modalbox.success .icon {
  background: #0a6;
}
.modalbox.error .icon {
  background: #ff424f;
}
.modalbox.success dl {
  overflow: hidden;
  margin-bottom: 1rem;
}
.modalbox.success dt,
.modalbox.success dd {
  width: 50%;
  float: left;
  text-align: left;
}
.modalbox.success dt {
  font-weight: bold;
}
.modalbox.success dd {
  margin-left: 0;
}

.center {
  float: none;
  margin-left: auto;
  margin-right: auto;
/* stupid browser compat. smh */
}
.center .change {
  clearn: both;
  display: block;
  font-size: 10px;
  color: #ccc;
  margin-top: 10px;
}
.redo.btn {
  border:none;
  margin: auto;
}

@-webkit-keyframes fall-in {
  0% {
    -webkit-transform: scale(3, 3);
    transform: scale(3, 3);
    opacity: 0;
  }
  50% {
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
    opacity: 1;
  }
  60% {
    -webkit-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
  }
  100% {
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
  }
}
@-webkit-keyframes plunge {
  0% {
    margin-top: -100%;
  }
  100% {
    margin-top: 25%;
  }
}
@-webkit-keyframes fall-in {
  0% {
    -webkit-transform: scale(3, 3);
    transform: scale(3, 3);
    opacity: 0;
  }
  50% {
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
    opacity: 1;
  }
  60% {
    -webkit-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
  }
  100% {
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
  }
}
@keyframes fall-in {
  0% {
    -webkit-transform: scale(3, 3);
    transform: scale(3, 3);
    opacity: 0;
  }
  50% {
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
    opacity: 1;
  }
  60% {
    -webkit-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
  }
  100% {
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
  }
}
@-webkit-keyframes plunge {
  0% {
    margin-top: -100%;
  }
  100% {
    margin-top: 15%;
  }
}
@keyframes plunge {
  0% {
    margin-top: -100%;
  }
  100% {
    margin-top: 15%;
  }
}