<div class="wrapper">
    <div class="title">Checkout form</div>
    <div class="checkout_form">
       <div class="input_item">
        <input type="text" placeholder="Card Holder Name">
     </div>
     <div class="input_item">
       <input type="text" placeholder="0000 0000 0000 0000" data-mask="0000 0000 0000 0000">
    </div>
    <div class="input_grp">
      <div class="input_item">
        <input type="text" placeholder="MM / YY" data-mask="00 / 00">
      </div>
      <div class="input_item">
        <input type="text" placeholder="* * *" data-mask="0 0 0">
      </div>
    </div>
      <div class="btn">
         <a href="#">proceed</a>
      </div>
  </div>
</div>

@import url('https://fonts.googleapis.com/css?family=Josefin+Sans');

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  outline: none;
  font-family: 'Josefin Sans', sans-serif;
}

body{
  background: #ffbf43;
}

.wrapper{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  background: #fff;
  max-width: 400px;
  width: 100%;
  border-radius: 20px;
  padding: 30px 0;
}

.wrapper .title{
  background: #f2483b;
  text-transform: uppercase;
  font-size: 18px;
  text-align: center;
  letter-spacing: 5px;
  height: 35px;
  line-height: 38px;
  color: #fff;
  margin-bottom: 10px;
}

.checkout_form{
  padding: 0 30px;
}

.checkout_form .input_item input[type="text"]{
  width: 100%;
  border: 0;
  background: transparent;
  text-align: center;
  border-bottom: 2px solid #dddddd;
  padding: 10px;
  transition: all 0.5s ease;
  color: #f2483b;
  font-size: 18px;
}

.checkout_form .input_item{
  margin-bottom: 10px;
}

.input_grp{
  margin-bottom: 10px;
}

.input_grp,
.input_grp .input_item.expiry_field{
  display: flex;
  justify-content: space-between;
}

.input_grp .input_item{
  width: 45%;
}

.input_grp .input_item.expiry_field input[type="text"]{
  width: 45%;
}

.btn{
  width: 150px;
  background: #f2483b;
  margin: 0 auto;
  height: 35px;
  line-height: 35px;
  text-align: center;
  border-radius: 20px;
}

.btn a{
  display: block;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 5px;
  color: #fff;
}

.checkout_form .input_item input[type="text"]:focus{
  border-bottom: 2px solid #f2483b;
}

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