* { box-sizing: border-box; } body {margin: 0;}#isyg{background-color:#ffffff;background-repeat:no-repeat;background-size:cover;background-position:center center;height:auto;}#illk{background-color:#ffffff;background-repeat:no-repeat;background-position:center;background-size:cover;height:auto;}#iitru{background-color:rgb(0, 0, 0);background-repeat:no-repeat;background-size:cover;background-position:center center;height:auto;}