Background image in bootstrap can't scale for both mobile and desktop. what do I do?

Question

I'm trying to make the background image scale to both mobile and desktop.

This code works on the desktop:

 /*
 * Globals
 */

/* Links */
a,
a:focus,
a:hover {
  color: #fff;
}

/* Custom default button */
.btn-default,
.btn-default:hover,
.btn-default:focus {
  color: #333;
  text-shadow: none; /* Prevent inheritence from `body` */
  background-color: #fff;
  border: 1px solid #fff;
}


/*
 * Base structure
 */

html,
body {
  height: 100%;
  background-color: #333;
}
body {
  color: #fff;
  text-align: center;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
  box-shadow: inset 0 0 100px rgba(0,0,0,.5);
}

/* Extra markup and styles for table-esque vertical and horizontal centering */
.site-wrapper {
  display: table;
  width: 100%;
  height: 100%; /* For at least Firefox */
  min-height: 100%;
}
.site-wrapper-inner {
  display: table-cell;
  vertical-align: top;
}
.cover-container {
  margin-left: auto;
  margin-right: auto;
}

/* Padding for spacing */
.inner {
  padding: 30px;
}


/*
 * Header
 */
.masthead-brand {
  margin-top: 10px;
  margin-bottom: 10px;
}

.masthead-nav > li {
  display: inline-block;
}
.masthead-nav > li + li {
  margin-left: 20px;
}
.masthead-nav > li > a {
  padding-left: 0;
  padding-right: 0;
  font-size: 16px;
  font-weight: bold;
  color: #fff; /* IE8 proofing */
  color: rgba(255,255,255,.75);
  border-bottom: 2px solid transparent;
}
.masthead-nav > li > a:hover,
.masthead-nav > li > a:focus {
  background-color: transparent;
  border-bottom-color: rgba(255,255,255,.25);
}
.masthead-nav > .active > a,
.masthead-nav > .active > a:hover,
.masthead-nav > .active > a:focus {
  color: #fff;
  border-bottom-color: #fff;
}

@media (min-width: 768px) {
  .masthead-brand {
    float: left;
  }
  .masthead-nav {
    float: right;
  }
}


/*
 * Cover
 */

.cover {
  padding: 0 20px;
}
.cover .btn-lg {
  padding: 10px 20px;
  font-weight: bold;
}


/*
 * Footer
 */

.mastfoot {
  color: #999; /* IE8 proofing */
  color: rgba(255,255,255,.5);
}


/*
 * Affix and center
 */

@media (min-width: 768px) {
  /* Pull out the header and footer */
  .masthead {
    position: fixed;
    top: 0;
  }
  .mastfoot {
    position: fixed;
    bottom: 0;
  }
  /* Start the vertical centering */
  .site-wrapper-inner {
    vertical-align: middle;
  }
  /* Handle the widths */
  .masthead,
  .mastfoot,
  .cover-container {
    width: 100%; /* Must be percentage or pixels for horizontal alignment */
  }
}

@media (min-width: 992px) {
  .masthead,
  .mastfoot,
  .cover-container {
    width: 700px;
  }
}

And this code on mobile:

/*
 * Globals
 */

/* Links */
a,
a:focus,
a:hover {
  color: #fff;
}

/* Custom default button */
.btn-default,
.btn-default:hover,
.btn-default:focus {
  color: #333;
  text-shadow: none; /* Prevent inheritence from `body` */
  background-color: #fff;
  border: 1px solid #fff;
}


/*
 * Base structure
 */

html,
body {
  height: auto%;
  background-color: #333;
}
body {
  color: #fff;
  text-align: center;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
  box-shadow: inset 0 0 100px rgba(0,0,0,.5);
}

/* Extra markup and styles for table-esque vertical and horizontal centering */
.site-wrapper {
  display: table;
  width: auto;
  height: auto; /* For at least Firefox */
  min-height: auto;
}
.site-wrapper-inner {
  display: table-cell;
  vertical-align: auto;
}
.cover-container {
  margin-left: auto;
  margin-right: auto;
}

/* Padding for spacing */
.inner {
  padding: 30px;
}


/*
 * Header
 */
.masthead-brand {
  margin-top: 10px;
  margin-bottom: 10px;
}

.masthead-nav > li {
  display: inline-block;
}
.masthead-nav > li + li {
  margin-left: 20px;
}
.masthead-nav > li > a {
  padding-left: 0;
  padding-right: 0;
  font-size: 16px;
  font-weight: bold;
  color: #fff; /* IE8 proofing */
  color: rgba(255,255,255,.75);
  border-bottom: 2px solid transparent;
}
.masthead-nav > li > a:hover,
.masthead-nav > li > a:focus {
  background-color: transparent;
  border-bottom-color: rgba(255,255,255,.25);
}
.masthead-nav > .active > a,
.masthead-nav > .active > a:hover,
.masthead-nav > .active > a:focus {
  color: #fff;
  border-bottom-color: #fff;
}

@media (min-width: 768px) {
  .masthead-brand {
    float: left;
  }
  .masthead-nav {
    float: right;
  }
}


/*
 * Cover
 */

.cover {
  padding: 0 20px;
}
.cover .btn-lg {
  padding: 10px 20px;
  font-weight: bold;
}


/*
 * Footer
 */

.mastfoot {
  color: #999; /* IE8 proofing */
  color: rgba(255,255,255,.5);
}


/*
 * Affix and center
 */

@media (min-width: 768px) {
  /* Pull out the header and footer */
  .masthead {
    position: fixed;
    top: 0;
  }
  .mastfoot {
    position: fixed;
    bottom: 0;
  }
  /* Start the vertical centering */
  .site-wrapper-inner {
    vertical-align: middle;
  }
  /* Handle the widths */
  .masthead,
  .mastfoot,
  .cover-container {
    width: 100%; /* Must be percentage or pixels for horizontal alignment */
  }
}

@media (min-width: 992px) {
  .masthead,
  .mastfoot,
  .cover-container {
    width: 700px;
  }
}

The only difference is that the width and height of things on the mobile version is set to auto. I need to make my site's background scale to both while still looking good.

i'm using the cover template by bootstrap (getbootstrap.com/examples/cover/) (the CSS and HTML is there if you look at it.)

Best regards,

jhillkhurana

Answer 1

Not sure if this is what you want, but here's how I did it.

First, set up the html file and body so that it's always a 100%

body {
    height: 100%;
    width: 100%;
}

html {
    height: 100%;
    overflow-x: hidden;
}

Then your landing page class, which also serves as a container for those content you want to always center no matter what the size of the screen is.

.landing {
    display: table;
    height: 100%;
    width: 100%;
    position: relative;
    background: url(imagefile) no-repeat center center;
    background-color: #7fbbda; //Put a color here so when your image is loading, your content has a temporary background
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover; 
}

.landing .text-container { //this is the container for your text contents
    display: table-cell;
    vertical-align: middle;
    text-align: center;
}

And this is how your html file should look like

<div class="landing">
    <div class="text-container">
        <h1>Text</h1>
        ...
    </div>
</div>

This renders properly for any devices

Answer 2

try overriding background properties using media queries for your mobile, just add a fiddle.