styles.css

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
      Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    font-size: 16px;
    background: #e6f1ff;
  }
  
  .wrapper {
    display: flex;
    margin: 40px auto 0;
    width: 80%;
  }
  
  .wrapper form {
    width: 100%;
  }
  
  .row {
    display: flex;
    width: 100%;
  }
  
  label {
    opacity: 0.6;
    font-size: 18px;
    padding-bottom: 7px;
    padding-top: 13px;
    font-weight: 500;
    display: block;
  }
  
  .mollie-component {
    background: #fff;
    box-shadow: 0px 1px 0px rgba(0, 0, 0, 0.1), 0px 2px 4px rgba(0, 0, 0, 0.1),
      0px 4px 8px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    padding: 13px;
    border: 1px solid transparent;
    transition: 0.15s border-color cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
  }
  
  .mollie-component.has-focus {
    border-color: #0077ff;
    transition: 0.3s border-color cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  .mollie-component.is-invalid {
    border-color: #ff1717;
    transition: 0.3s border-color cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  .field-error {
    font-size: 12px;
    margin-top: 2px;
    color: #ff1717;
    font-weight: 400;
  }
  
  button.submit-button {
    width: 100%;
    border: 0;
    background: #0077ff;
    box-shadow: 0px 1px 0px rgba(0, 0, 0, 0.1), 0px 2px 4px rgba(0, 0, 0, 0.1),
      0px 4px 8px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    padding: 14px;
    color: #ffffff;
    font-weight: 600;
    font-size: 18px;
    opacity: 0.9;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
      Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    outline: 0;
    transition: 0.3s opacity cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  button.submit-button:hover {
    opacity: 1;
  }
  
  .form-fields {
    margin-bottom: 24px;
  }
  
  .form-group {
    width: 100%;
  }
  
  .form-group--expiry-date {
    margin-right: 8px;
  }
  
  .form-group--verification-code {
    margin-left: 8px;
  }