body{ 
    font-family: Arial, Helvetica, sans-serif;
    
    
}

 #sisa{
   
     width: 1100px;
     margin: 0px auto;
     position: relative;
     z-index: 2;
    
}
nav ul li{    
    float: left;
    list-style: none;
    margin: 10px;
    text-align: center;
    
}
h4{
    color: white;
}
div{
    text-align: center;
    margin: 0px auto;

}
#redes{
    width: 1100px;
    margin: 0px auto;
    position: relative;
}