CSS3 div background-image autoresize - css

Question

I was looking for many posts here on stackoverflow, but there was nothing, what could help me. Maybe this question is trivial, but i don't know how to do that, because I am beginner in this
So i have some header, where is logo, menu and some title -that is not problem. Under this header i have div with class slider, where i want to have some background-image and on this background-image i want to have some button and title and another image. And here is finally my question.
What should i do, if i want to have this background-image of this div on full width and with auto height (height from end of header to end of screen) for any screen resolution on desktop?
I mean: if i have resolution 1920x1080 i want to have this bg-image from end of header to end of screen. Same thing for resolution for example 1366x768 etc etc...i hope you understand my question.
Example on this
image
Header is red. And i want to have bg-image (in this case white part of image, but i want to have image there) auto resize for any screen resolution.
I really hope you understand my question and someone can help me.
Really thanks for any reply
http://jsfiddle.net/YKY4t/
I have some errors in code so please...
Code:
#import url(https://fonts.googleapis.com/css?family=Quicksand:400,300,700);
body {
margin: 0;
padding: 0;
}
.mainheader {
width: 100%;
height: 10%;
background-color: #ff5959;
position: absolute;
}
.mainheader img {
max-width: 100%;
height: auto;
margin-left: 20%;
margin-top: 1.5%;
float: left;
}
.title {
position: absolute;
margin-top: 1%;
margin-left: 22%;
font-size: 35px;
font-family: 'Quicksand', sans-serif;
color: #ffffff;
}
.meta {
position: absolute;
margin-left: 18%;
margin-top: 3%;
font-size: 19px;
font-family: 'Quicksand',sans-serif;
font-weight: bold;
color: #ffffff;
}
.nav {
position: absolute;
right: 20%;
margin-top: 1%;
font-size: 19px;
font-family: 'Quicksand', sans-serif;
font-weight: bold;
}
.nav li {
list-style-type: none;
float: left;
}
.nav li a {
color: #ffffff;
text-decoration: none;
display: block;
margin-left: 25%;
}
.slider img {
background-image: url(../img/slider-image.png);
background-repeat: no-repeat;
background-position: center center fixed;
background-size: cover;
}

Answer 1

As i commented, you can use media queries for the different screen sizes where you can use different resolution images. In that case:
#media all and (min-width: 1920) {
.img-holder img{
background-img: url(../img/slider-image.png);
}
}
#media all and (min-width: 1366) {
.img-holder img{
background-img: url(../img/slider-image-medium.png);
}
}
You can use them to use all screen resolutions you want to cover.
You alse can use any responsive framework like Bootstrap which responsives the images.