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<div class="aaaa" style="
bottom: 0px;
left: 00px;
position: fixed;
background-image: url('/wp-content/themes/n/images/lb.png');
width: 50px;
height: 50px;
"><div ><img class="nb" style="
margin-left: -250px;
top: 350px;
position: fixed;
" src="http://miao.link/wp-content/uploads/2014/10/nbird.png" ></div></div>
.wrapp .aaaa:hover .nb {
margin-left: 0px;
top: 350px;
position: fixed;
}