how can i change the color of the box prev or next

Hi,

how can i change the color of the box prev or next story

and also, if you can help me to know how to change the gray background of the module of advert5 please

thank you!

In layout.css:

ul.pagenav li.pagenav-prev a:hover {
background: url(../images/custom/prev_hover.png) no-repeat center;
}
ul.pagenav li.pagenav-prev a {
display: block;
float: left;
width: 124px;
height: 60px;
text-indent: -9999px;
background: url(../images/custom/prev.png) no-repeat center;
}

ul.pagenav li.pagenav-next a:hover {
background: url(../images/custom/next_hover.png) no-repeat center;
}
ul.pagenav li.pagenav-next a {
display: block;
float: right;
width: 124px;
height: 60px;
text-indent: -9999px;
background: url(../images/custom/next.png) no-repeat center;
}

all 4 images are in :

templates/hot_tennis/images/custom/