#box4{width:0;border-right: 30px solid #6c6;border-top: 52px solid transparent;border-bottom: 52px solid transparent;float: left;}
#box5{width: 60px;height: 104px;background-color: #6c6;float: left;}
#box6{width:0;border-left: 30px solid #6c6;border-top: 52px solid transparent;border-bottom: 52px solid transparent;float: left;}
<div id="box4"></div>
<div id="box5"></div>
<div id="box6"></div>
