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HTML 

              
                <!DOCTYPE html>
<html lang="en">
<head>

  <meta charset="UTF-8">
  <title>Daily UI | #002 - Credit Card Checkout</title>
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,600|Abel">

</head>
<body class="align">

  <div class="grid align__item">

    <h2>Enter your payment information below</h2>

    <div class="card">

      <header class="card__header">
        <h3 class="card__title">Payment Details</h3>
        <svg xmlns="http://www.w3.org/2000/svg" class="card__logo" width="140" height="43" viewBox="0 0 175.7 53.9"><style>.visa{fill:#fff;}</style><path class="visa" d="M61.9 53.1l8.9-52.2h14.2l-8.9 52.2zm65.8-50.9c-2.8-1.1-7.2-2.2-12.7-2.2-14.1 0-24 7.1-24 17.2-.1 7.5 7.1 11.7 12.5 14.2 5.5 2.6 7.4 4.2 7.4 6.5 0 3.5-4.4 5.1-8.5 5.1-5.7 0-8.7-.8-13.4-2.7l-2-.9-2 11.7c3.3 1.5 9.5 2.7 15.9 2.8 15 0 24.7-7 24.8-17.8.1-5.9-3.7-10.5-11.9-14.2-5-2.4-8-4-8-6.5 0-2.2 2.6-4.5 8.1-4.5 4.7-.1 8 .9 10.6 2l1.3.6 1.9-11.3M164.2 1h-11c-3.4 0-6 .9-7.5 4.3l-21.1 47.8h14.9s2.4-6.4 3-7.8h18.2c.4 1.8 1.7 7.8 1.7 7.8h13.2l-11.4-52.1m-17.5 33.6c1.2-3 5.7-14.6 5.7-14.6-.1.1 1.2-3 1.9-5l1 4.5s2.7 12.5 3.3 15.1h-11.9zm-96.7-33.7l-14 35.6-1.5-7.2c-2.5-8.3-10.6-17.4-19.6-21.9l12.7 45.7h15.1l22.4-52.2h-15.1"/><path fill="#F7A600" d="M23.1.9h-22.9l-.2 1.1c17.9 4.3 29.7 14.8 34.6 27.3l-5-24c-.9-3.3-3.4-4.3-6.5-4.4"/></svg>

      </header>

      <form action="" method="post" class="form">

        <div class="card__number form__field">
          <label for="card__number" class="card__number__label">Card Number</label>
          <input type="text" id="card__number" class="card__number__input" placeholder="4000 1234 5678 9010">
        </div>


        <div class="card__expiration form__field">
          <label for="card__expiration__year">Expiration</label>
          <select name="" id="card__expiration__year">
            <option value="january">January</option>
            <option value="februrary">Februrary</option>
            <option value="march">March</option>
            <option value="april">April</option>
            <option value="may">May</option>
            <option value="june">June</option>
            <option value="july">July</option>
            <option value="august">August</option>
            <option value="september">September</option>
            <option value="october">October</option>
            <option value="november">November</option>
            <option value="december">December</option>
          </select>

          <select name="" id="">
            <option value="2021">2021</option>
            <option value="2022">2022</option>
            <option value="2023">2023</option>
            <option value="2024">2024</option>
          </select>
        </div>

        <div class="card__ccv form__field">
          <label for="">CCV</label>
          <input type="text" class="card__ccv__input" placeholder="583">
        </div>

      </form>

    </div>

    <p class="text--center"><a href="#">change</a> payment method</p>

  </div>

  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>

</body>
</html>
!

CSS 

              
                @mixin clearfix() {

  &:before,
  &:after {
    content: ' ';
    display: table;
  }

  &:after {
    clear: both;
  }

}

$base-bgcolor: #f1f1f1;
$base-color: #171a1c;
$base-font-weight: 300;
$base-font-size: 1rem;
$base-line-height: 1.5;
$base-font-family: Source Sans Pro;
$base-font-family-fallback: sans-serif;

* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  background-color: $base-bgcolor;
  color: $base-color;
  font: $base-font-weight #{$base-font-size}/#{$base-line-height} $base-font-family, $base-font-family-fallback;
  margin: 0;
  min-height: 100%;
  padding: 5vw 0;
}

.align {
  align-items: center;
  display: flex;
  flex-direction: row;

  &__item {

    &--start {
      align-self: flex-start;
    }

    &--end {
      align-self: flex-end;
    }

  }

}

.text {

  &--center {
    text-align: center;
  }

}

$card-bgcolor: #171a1c;
$card-border-radius: 1rem;
$card-color: #47474e;
$card-padding: 2rem;

.card {
  background-color: $card-bgcolor;
  border-radius: $card-border-radius;
  color: $card-color;
  padding: $card-padding;
  font-family: Abel;

  &__header {
    @include clearfix();
    margin-bottom: 4rem;
  }

  &__title {
    color: #fff;
    float: left;
    font-size: 1.5rem;
  }

  &__logo {
    float: right;
  }

  &__number {

    &__input {
      font-size: 2rem;
    }

  }

  &__expiration {
    float: left;
  }

  &__ccv {
    float: right;

    &__input {
      width: 1.75rem;
    }

  }

  .ui-selectmenu-button {
    float: left;
    margin-right: 2rem;
  }

}

$input-color: #fff;

input {
  background-color: transparent;
  border: 0;
  color: $input-color;
  font: inherit;
  width: auto;

  &::placeholder {
    color: $input-color;
  }

}

label {
  display: block;
}

.form {
  @include clearfix();

  &__field {
    margin-bottom: 1.5rem;
  }

  input {
    outline: 0;

    &[type="email"],
    &[type="password"] {
      width: 100%;
    }

  }

}

$grid-max-width: 36rem;
$grid-width: 90%;

.grid {
  margin: 0 auto;
  max-width: $grid-max-width;
  width: $grid-width;
}

h1,
h2,
h3 {
  margin: 0 0 .5rem;
}

svg {
  height: auto;
  max-width: 100%;
  vertical-align: middle;
}

$link-color: #171a1c;

a {
  color: $link-color
}

.ui-selectmenu {

  &-menu {
    display: none;
    font-family: Abel;
    left: 0;
    margin: 0;
    padding: 0;
    position: absolute;
    top: 0;
    z-index: 999;

    li {
      background-color: #171a1c;
      color: #fff;
      padding: .25rem 1rem;
      cursor: pointer;

      &.ui-state-focus {
        background-color: #47474e;
      }

    }

    .ui-menu {
      list-style: none;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      overflow: auto;
    }

  }

  &-open {
    display: block;
  }

  &-button {
    color: #fff;
    cursor: pointer;
    outline: 0;

    &.ui-corner-top {

      .ui-icon-triangle-1-s {
        transform: rotate(-180deg);
      }

    }

    .ui-icon-triangle-1-s {
      background: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="-254 408.9 42 24" fill="#47474e"><path d="M-212 411.9c0-1.7-1.3-3-3-3-.8 0-1.5.3-2.1.8l-15.9 15.9-15.7-15.7c-.5-.6-1.4-1-2.3-1-1.7 0-3 1.3-3 3 0 .8.3 1.5.8 2.1l18 18c.5.6 1.3.9 2.2.9.8 0 1.6-.4 2.2-.9l18-18c.5-.6.8-1.3.8-2.1z"/></svg>') 50% / 14px no-repeat;
      float: right;
      height: 14px;
      margin-top: 5px;
      transform-origin: 50%;
      transition: transform .3s;
      width: 14px;
    }

  }

}
!

JS 

              
                (function($) {
  'use strict';

  // Selectmenu
  $('select').selectmenu();
  
}(jQuery));
!
999px

Console