How to horizontally and vertically center a navbar? - html

Question

I want to make my navbar directly in the middle of the page. So as i scroll down the rest of my content appears from beneath. Could someone please help and also explain how to position my background image to fixed so as i scroll the background doesn't move and lose its quality in resolution.
.menu-wrap {
width: 750px;
margin: 0 auto;
list-style: none;
}
/* DROPDOWN */
.ulMenu {
padding: 0;
margin: 0;
}
.navMenu ul {
padding: 0;
margin: 0;
line-height: 30px;
}
navMenu {
padding: 0;
margin: 0;
}
.navMenu li {
list-style-type: none;
padding: 0;
margin: 0;
float: left;
position: relative;
}
.navMenu ul li a {
text-align: center;
padding: 10px;
width: 150px;
height: 30px;
display: block;
color: white;
background-color: rgba(233, 233, 233, 0.5);
text-decoration: none;
border-radius: 0px;
font-family: 'Raleway', sans-serif;
font-size: 20px;
}
.navMenu ul ul {
position: absolute;
visibility: hidden;
}
.navMenu ul li:hover ul {
visibility: visible;
}
.ulMenu .arrow {
font-size: 10px;
}
.navMenu ul li:hover ul li a:hover {
background-color: rgba(93, 93, 93, 0.5);
}
.navMenu li:hover {
background-color: none;
}
.navMenu a:hover {
color: blue;
}
.navMenu ul li ul li {
padding: 2px 0 0 0;
}
.navMenu ul li {
padding: 0 2px 0 0;
}
/* DROPDOWN ENDED */
html {
background-image: url("indexImg.jpg");
background-size: cover;
}
<div class="menu-wrap">
<nav class="navMenu">
<ul class="ulMenu">
<li>Home
</li>
<li>
Products<span class="arrow">▼</span>
<ul>
<li>#
</li>
<li>#
</li>
</ul>
</li>
<li>Contact Us
</li>
<li>About
</li>
</ul>
</nav>
</div>

Answer 1

.menu-wrap {
position: relative;
}
.navMenu {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}

Answer 2

I hope this is what u need
Check if it could complete your code
HTML
<nav>
<ul class="nav">
<li>Home</li>
<li>Product
<ul>
<li>item</li>
<li>item</li>
<li>item</li>
<li>item</li>
</ul>
</li>
<li>Contact us
<li>About</li>
CSS
nav {
display: block;
text-align: center;
}
nav ul {
margin: 0;
padding:0;
list-style: none;
}
.nav a {
display:block;
background: #111;
color: #fff;
text-decoration: none;
padding: 0.8em 1.8em;
text-transform: uppercase;
font-size: 80%;
letter-spacing: 2px;
text-shadow: 0 -1px 0 #000;
position: relative;
}
.nav{
vertical-align: top;
display: inline-block;
box-shadow:
1px -1px -1px 1px #000,
-1px 1px -1px 1px #fff,
0 0 6px 3px #fff;
border-radius:6px;
}
.nav li {
position: relative;
}
.nav > li {
float: left;
border-bottom: 4px #aaa solid;
margin-right: 1px;
}
.nav > li > a {
margin-bottom: 1px;
box-shadow: inset 0 2em .33em -0.5em #555;
}
.nav > li:hover,
.nav > li:hover > a {
border-bottom-color: orange;
}
.nav li:hover > a {
color:orange;
}
.nav > li:first-child {
border-radius: 4px 0 0 4px;
}
.nav > li:first-child > a {
border-radius: 4px 0 0 0;
}
.nav > li:last-child {
border-radius: 0 0 4px 0;
margin-right: 0;
}
.nav > li:last-child > a {
border-radius: 0 4px 0 0;
}
.nav li li a {
margin-top: 1px;
}
.nav li a:first-child:nth-last-child(2):before {
content: "";
position: absolute;
height: 0;
width: 0;
border: 5px solid transparent;
top: 50% ;
right:5px;
}
.nav ul {
position: absolute;
white-space: nowrap;
border-bottom: 5px solid orange;
z-index: 1;
left: -99999em;
}
.nav > li:hover > ul {
left: auto;
margin-top: 5px;
min-width: 100%;
}
.nav > li li:hover > ul {
left: 100%;
margin-left: 1px;
top: -1px;
}
/* arrow hover styling */
.nav > li > a:first-child:nth-last-child(2):before {
border-top-color: #aaa;
}
.nav > li:hover > a:first-child:nth-last-child(2):before {
border: 5px solid transparent;
border-bottom-color: orange;
margin-top:-5px
}
.nav li li > a:first-child:nth-last-child(2):before {
border-left-color: #aaa;
margin-top: -5px
}
.nav li li:hover > a:first-child:nth-last-child(2):before {
border: 5px solid transparent;
border-right-color: orange;
right: 10px;
}