Вопросы по CSS

-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;

<div id="attachment_20917" class="wp-caption aligncenter" ><a href="?i=wp-content/uploads/2013/12/Paul-Walker-in-Car-Race-300x168.jpg"><a href=http://daryo.uz/wp-content/uploads/2013/12/Paul-Walker-in-Car-Race-886x498.jpg><img class="size-large wp-image-20917" alt="Paul-Walker-in-Car-Race" src="http://daryo.uz/wp-content/uploads/2013/12/Paul-Walker-in-Car-Race-300x168.jpg"></a></a><p class="wp-caption-text">Foto © wallpaperhdfree.com</p></div>

<style>

#attachment_20917 {
background:#f5f3f6;
border:1px solid #dddddd;
width:300px;
padding-top:10px;
padding-bottom:10px;
padding-left:1px;
padding-right:1px;
border-radius:5px;
text-align:center;
font-family:verdana;
font-size:13px;
color:#8f8f8f;
font-weight:300;
}
</style>

<style>

#attachment_20917 {
background:#f5f3f6;
border:1px solid #dddddd;
width:300px;
padding-top:10px;
padding-bottom:10px;
padding-left:1px;
padding-right:1px;
border-radius:5px;
text-align:center;
font-family:verdana;
font-size:13px;
color:#8f8f8f;
font-weight:300;
}
 .wp-caption { 
 background-color: #F3F3F3; 
 font-family: "PT Sans", Helvetica, Arial, sans-serif; 
 border: 1px solid #DDDDDD; 
 border-radius: 3px 3px 3px 3px; 
 margin: 10px; 
 padding-top: 4px; 
 text-align: center; 
 display: table; 
 width: 10px; 
 } 
img {
align: center;
 -webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
} 
 .wp-caption-text { 
 margin-bottom:10px; 
 }