#wrapper {
    width: 700px;
    height: 1000px;
    margin-left: auto;
    margin-right: auto;
    border-style: solid;
    border-width: thin;
    
}

#header {
    width: 600px;
    height: 100px;
    margin-left: auto;
    margin-right: auto;
    border-style: solid;
    border-width: thin; 
    background-color: #CCC;
    
    
}
#menu {
    width: 100px;
    height: 600px;
    margin-left: 50px;
    border-style: solid;
    border-width: thin; 
    float: left;
    
    
}
#content {
    width: 475px;
    height: 600px;
    margin-right: 50px;
    border-style: solid;
    border-width: thin; 
    float: right;
    
    
}