.connect{ height: 1000px; } .connect .con{ background: #F5F5F5; margin-left: 200px; float: left; margin-top: 50px; margin-right: 40px; width: 440px; height: 250px; } .connect .con2{ background: #F5F5F5; float: left; margin-top: 50px; margin-right:40px ; width: 440px; height: 250px; } .connect .con3{ margin-top: 100px; text-align:center; padding-top: 25px; float: left; margin-left: 200px; width: 1400px; height: 500px; border: 1px solid #f5f5f5; }