https://www.w3schools.com/css/tryit.asp?filename=trycss_background-image_bad

span.mz {border-radius: 30px;
-moz-border-radius: 30px;
-webkit-border-radius: 30px;
padding: 3px 7px;
color: #fff;
background-color:#89db08;
background-image: -webkit-linear-gradient(bottom, #3f6405 0%, #a9ef3b 100 ;
background-image: -moz-linear-gradient(bottom, #3f6405 0%, #a9ef3b 100 ;
background-image: -o-linear-gradient(bottom, #3f6405 0%, #a9ef3b 100 ;}


echo'<span class="digit esmall">
<span class="l">&nbsp;</span><span class="mz">'.$user['zatochka'].'</span><span class="r">&nbsp;</span>
</span>';