[SOLVED] Remove background color and centre

.menu {
font-family: arial, sans-serif; 
width:750px; 
margin: 0;
}

.menu ul {
padding:0; 
margin:0;
list-style-type: none;
}

.menu ul li {
float:left; 
position:relative;
}

.menu ul li a, .menu ul li a:visited {
display:block; 
text-align:center; 
text-decoration:none; 
width:75px; 
height:21px; 
line-height:21px; 
font-size:11px;
}

.menu ul li ul {
display: none;
}

.menu ul li:hover a {
color:#fff; 
}

.menu ul li:hover ul {
display:block; 
position:absolute; 
top:31px; 
left:0; 
width:105px;
}

.menu ul li:hover ul li a {
display:block; 
color:#000;
}

.menu ul li:hover ul li a:hover {
color:#000;
}