styles.css

@import url("https://fonts.googleapis.com/css?family=Roboto");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  outline: none;
  font-family: "Roboto", sans-serif;
}

body {
 background: url("bg.png") no-repeat top center;
  width: 100%;
  height: 100vh;
  background-size: cover;
}

.checkout_form {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 380px;
  width: 100%;
  background: rgba(225,225,225,0.35);
  padding: 30px;
  border-radius: 25px;
}

.card_number {
  margin-bottom: 25px;
}

input[type="text"] {
  padding: 10px;
  border-radius: 3px;
  font-size: 16px;
  border: 2px solid #9e9e9e;
  border: 0;
  text-align: center;
}

.card_number .input {
  width: 100%;
  text-align: left;
}


.card_grp {
  display: flex;
  justify-content: space-between;
  margin-bottom: 25px;
}


.expiry_date,
.cvc {
  width: 48%;
  display: flex;
}

.expiry_date .expiry_input {
  width: 60px;
  margin-right: 10px;
}

.cvc {
  justify-content: flex-end;
  align-items: center;
}

.cvc .cvc_input {
  width: 80px;
  margin-right: 10px;
}


.cvc_img {
  border: 2px solid #fff;
  width: 25px;
  height: 25px;
  font-size: 18px;
  color: #fff;
  font-weight: bold;
  border-radius: 50%;
  text-align: center;
  cursor: pointer;
  position: relative;
}

.cvc_img .img {
  position: absolute;
  width: 100px;
  height: 80px;
  padding: 10px 10px 5px;
  border-radius: 3px;
  top: -30px;
  right: 33px;
  background: #064887;
  display: none;
}

.cvc_img .img img {
  width: 100%;
  height: 100%;
}

.cvc_img:hover .img {
  display: block;
}

.btn {
  width: 100%;
  background: #064887;
  color: #fff;
  padding: 10px;
  border-radius: 3px;
  text-align: center;
  font-size: 18px;
  text-transform: uppercase;
  cursor: pointer;
  letter-spacing: 5px;
}

::-webkit-input-placeholder {
  /* Chrome/Opera/Safari */
  color: #064887;
}
::-moz-placeholder {
  /* Firefox 19+ */
  color: #064887;
}
:-ms-input-placeholder {
  /* IE 10+ */
  color: #064887;
}



@media screen and (max-width: 420px) {
  .card_grp {
    flex-direction: column;
  }
  .expiry_date {
    width: 100%;
    justify-content: space-between;
    margin-bottom: 25px;
  }
  .expiry_date .expiry_input {
    width: 48%;
    margin: 0;
  }
  .cvc {
    width: 100%;
    justify-content: space-between;
  }
  .cvc .cvc_input {
    width: 48%;
  }
  .cvc_img .img {
    right: 26px;
  }
}



/* Credit Card Validator */
#card-container {
  position: relative;
  width: 100%;
}

#logo {
  width: 46px;
  height: 30px;
  position: absolute;
  top: 5px;
  right: 7px;
}

.visa {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 0 no-repeat;
}
.mastercard {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -30px no-repeat;
}
.amex {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -60px no-repeat;
}
.diners {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -90px no-repeat;
}
.discover {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -120px no-repeat;
}
.shopping {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -150px no-repeat;
}
.naranja {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -180px no-repeat;
}
.qida {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -210px no-repeat;
}
.clubdia {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -240px no-repeat;
}
.musicred {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -270px no-repeat;
}
.nevada {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -300px no-repeat;
}
.tuya {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -330px no-repeat;
}
.laanonima {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -360px no-repeat;
}
.crediguia {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -390px no-repeat;
}
.patagonia {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -410px no-repeat;
}
.sol {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -440px no-repeat;
}
.cabal {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -470px no-repeat;
}
.cencosud {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -500px no-repeat;
}
.credimas {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -530px no-repeat;
}
.carrefour {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -560px no-repeat;
}
.grupar {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -590px no-repeat;
}
.wishgift {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -610px no-repeat;
}
.unknown {
  background: url("https://jscardvalidator-mpccmwdwqf.now.sh/cards_sprite_compressed_30.jpg")
    0 -640px no-repeat;
}