.forma {
	float: left;
	border-radius: 10px;
	width: 320px;
    background-color: #f2f2f2;
    padding: 25px 15px 25px 25px;
}


.forma input[type=text],.forma input[type=date],.forma select{
    width: 90%;
    padding: 12px 20px;
    margin: 8px 0;
    display: inline-block;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}
.forma button, .forma input[type=submit], .forma input[type=reset] {
    width: 90%;
    background-color: #4CAF50;
    border: none;
    color: white;
    border-radius: 5px;
    padding: 17px 32px;
    text-decoration: none;
    margin: 4px 2px;
    cursor: pointer;
}


 <form  method="post">
            <div class="forma">
                    <input type="text" name="ime" placeholder="<?php echo $lang->parse('ime_klijenta');?>">
                    <span class="err">*</span>
                    <input type="text"  name="prezime" placeholder="<?php echo $lang->parse('prezime_klijenta');?>">
                    <span class="err">*</span>
                    <input type="text"  name="mjesto" placeholder="<?php echo $lang->parse('mjesto_klijenta');?>">
                    <input type="text"  name="posta" placeholder="<?php echo $lang->parse('posta_klijenta'); ?>">
                    <input type="text"  name="zemlja" placeholder="<?php echo $lang->parse('zemlja_klijenta');?>">
                    <input type="text"  name="telefon" placeholder="<?php echo $lang->parse('telefon_klijenta');?>">
                    <input type="text"  name="fax" placeholder="<?php echo $lang->parse('fax_klijenta'); ?>">
            </div>
 			<div class="forma">
                    <input type="text"  name="e_mail" placeholder="<?php echo $lang->parse('e_mail_klijenta');?>">
                    <input type="text"  name="www" placeholder="<?php echo $lang->parse('www_klijenta'); ?>">
                    <input type="text"  name="trans_racun1" placeholder="<?php echo $lang->parse('racun_klijenta');?>">
                    <input type="text"  name="maticni_br" placeholder="<?php echo $lang->parse('maticni_broj_klijenta');?>">
                    <input type="text"  name="br_pasosa" placeholder="<?php echo $lang->parse('br_pasosa_klijenta'); ?>">
                    <span class="err">*</span>
                    <input type="text"  name="poreski_br" placeholder="<?php echo $lang->parse('poreski_br_klijenta');?>">
                    <button type="submit" name="save" ><?php echo $lang->parse('zapisi');?></button>
              </div>
            </form>