Acil bir div sorunum var!!!

header { 
  	width: 100%; 
  	height: 110px; 
  	background-color: white; 
  	position: fixed; 
  	z-index: 1000; 
  	text-align: center; 
  	margin: auto; 
  } 
  header ul { 
  	margin-top: 21px; 
  } 
  header ul li { 
  	display: inline-block; 
  	margin-left: 60px; 
  	font-size: 12px; 
  	font-family: Ubuntu, "Ubuntu Light"; 
  	 
  } 
  header ul li a { 
  	text-decoration: none; 
  	color: #000; 
  } 
  header ul li a:hover { 
  	color: #F90; 
  } 
  header ul li a:active { 
  	color: #FC0; 
  } 
  header ul li:first-child { 
  	margin-left: 0px; 
  } 
  /*KÜÇÜK TELEFON GENİŞLİĞİ**** @media screen and (max-width:320px) { 
  header { 
  	width: 320px; 
  } 
  header ul li { 
  	margin-left: 5px; 
  	font-size: 10px; 
  } 
  }*/ 
   
  /*İPhone GENİŞLİĞİ*/@media screen and (min-width:321px) and (max-width:480px) { 
  header { 
  	width: 480px; 
  	background-color:#F30; 
  } 
  header ul li { 
  	margin-left: 10px; 
   
  	margin-left: 10px; 
  	font-size: 12px; 
   
  } 
  } 
  /*KÜÇÜK TABLET*/@media screen and (min-width:481px) and (max-width:768px) { 
  header { 
  	width: 768px; 
  	 
  } 
  } 
  /*iPad-PORTRAIT*/@media screen and (min-width:769px) and (max-width:1024px) { 
  header { 
  	width: 1024px; 
  	 
  } 
  } 
  .height-110px { 
  	height: 110px; 
  }