php分页中的div侧栏纠错

Wrapper center div

sidebar div

when click "sidste" button that are the last page in php paging. Sidebar div content moves under center div.

navigation paging php css

The webpage is responsive but navigation is giving this error problem. Where can the problem be?

css:

.wrapper
     margin-right: auto;
     margin-left:  auto;
     width: 100%;      
     max-width: 1280px;
     padding-right: 10px;
     padding-left:  10px;
     overflow: hidden;


   .divcenter
    float: left;      
    width: 70%; 
    margin-bottom:3px;
    padding: 1.25em;
    word-wrap: break-word;
    margin: 0 auto;
    clear:both;
    border:3px solid  #ccc;
    margin-left:110px;
    


   .divrightsidebar
    float:right;
    width: 30%;
    margin:0px;
    margin-bottom:3px;
    padding: 1.25em;
    word-wrap: break-word
    margin: 0 auto;

</div>