panel {
width: 100%;
}
 
#panel > dt {
border-bottom: solid 1px white;
color: white;
cursor: pointer;
padding:13px 0;
text-align:center;
font-size:20px;
}
 
#panel > dd {
margin: 0px;
padding: 10px;
background:#fff;
}

#panel dd a{
color:#444;
display:block;
padding:10px 0;
}