#desc_bj {
width: 60%;
float: left;
}
#acc_h1 {
width: 100%;
clear: both;
padding: 10px;
background-color: #000000;
text-align: center;
}
#der_articles {
width: 50%;
float: left;
padding: 10px;
text-align: center;
}
#pem_ac {
width: 25%;
float: left;
text-align: center;
}