#credit-card-entry input {    
      font-size: 14px;    
      font-family: Arial, Helvetica, sans-serif;
      color: #555
    }
    
    #credit-card-entry input::placeholder {    
      font-size: 14px;    
      font-family: Arial, Helvetica, sans-serif;
      color: #adadad
    }    

    #credit-card-entry input:focus {    
      color: black
    }