<style>
.ppss{width:500px;height:520px;}
.ppss h2{padding:0;margin:0;height:20px;width:500px;}
.xinzeng1,.xinzeng2,.xinzeng3,.xinzeng4{width:250px;height:250px;float:left;color:#fff;}
.xinzeng1{background:#f00;}
.xinzeng2{background:#0f0;}
.xinzeng3{background:#00f;}
.xinzeng4{background:#000;}
<div class="ppss">
<h2>真心话</h2>
<div class="xinzeng1">A</div>
<div class="xinzeng2">B</div>
<div class="xinzeng3">C</div>
<div class="xinzeng4">D</div>
<div style="clear:both;"></div>
</div>
里面四个DIV都设置浮云就可以了,注意容器宽度和里面DIV的总宽度就可以了。