You can add below css to templates/jf_calla-exteriors/css/template.css:
/* --- Pagination --- */
div.pagination {padding:8px;margin:24px 0 4px 0;text-align:center;color:#999;}
div.pagination ul {text-align:center;}
div.pagination ul li {background: url(../images/panigation.png) no-repeat;color:#fff;font-family: misobold;font-size:24px;display:inline-block;line-height:46px;height:51px;width:57px;margin:0 5px;}
div.pagination ul li a {color: #fff;}
div.pagination ul li.pagination-start {background: url(../images/panigation-start.png) no-repeat;}
div.pagination ul li.pagination-prev {background: url(../images/panigation-prev.png) no-repeat;}
div.pagination ul li.pagination-next {background: url(../images/panigation-next.png) no-repeat;}
div.pagination ul li.pagination-end {background: url(../images/panigation-end.png) no-repeat;}
div.pagination ul li.pagination-start span,
div.pagination ul li.pagination-prev span,
div.pagination ul li.pagination-next span,
div.pagination ul li.pagination-end span,
div.pagination ul li.pagination-start a,
div.pagination ul li.pagination-prev a,
div.pagination ul li.pagination-next a,
div.pagination ul li.pagination-end a {
color: transparent;
}
joomfreak