Код:
.chatHeader{ 
height:45px; 
width:100%; 
position: relative; 
background-image: url("http://imgs.su/users/70140/1488824861.gif "), url("Адрес картинки"); 
background-position: bottom 1px left 0, bottom left 50%, left 0px bottom; 
background-repeat: no-repeat, no-repeat, repeat-x ; 
background-size: auto 100%,auto 100%,102% 100%; 

border-image-width: 2px; 
border-image-source: url(http://imgs.su/users/70140/1488826733.gif); 
border-image-slice: 30; 
border-image-repeat: stretch; 


}