How to cover background images in Bootstrap 3 grids?

Question

I'm trying to make a landing page using Bootstrap 3. I want a top image in a full width column with three images below it in columns across and no margins or borders so the images joins seamlessly.

I can get close but when I narrow the view port a space opens up between the top image an the ones below it.

Here is the URL:

Here is my code:

HTML:

<div class="container-fluid">
  <div class="row">      

    <div class="landing-col col-xs-12"></div>

  </div>

  <div class="row">

    <div class="first-col col-sm-4"></div>                      
    <div class="second-col col-sm-4"></div>           
    <div class="third-col col-sm-4"></div>

  </div>

</div>

CSS:

.landing-col {
   background: url('../images/99.jpg') no-repeat;
   -webkit-background-size: 100% auto;
   -moz-background-size: 100% auto;
   -o-background-size: 100% auto;
    background-size: 100% auto;
    height: 500px; }

.first-col {
   background: url('../images/44.jpg') no-repeat;
   -webkit-background-size: 100% auto;
   -moz-background-size: 100% auto;
   -o-background-size: 100% auto;
    background-size: 100% auto;
    height: 300px;
}

.second-col {
background: url('../images/33.jpg') no-repeat;
-webkit-background-size: 100% auto;
-moz-background-size: 100% auto;
-o-background-size: 100% auto;
 background-size: 100% auto;
 height: 300px;
}

.third-col {
background: url('../images/22.jpg') no-repeat;
-webkit-background-size: 100% auto;
-moz-background-size: 100% auto;
-o-background-size: 100% auto;
 background-size: 100% auto;
 height: 300px;
}

I have tried using min-width and max-width with 100% but they don't work for me.

A possibility might be to use a media query to get the exact width of the current grid and set the image width inside it to that width. Is this possible?

Answer 1

You can use block element with background image where height is set via padding-bottom with percentage value

.img {
    margin-right: -15px; // Remove right gap
    margin-left: -15px;  // Remove left gap
    padding-bottom: 62.5%; // ratio is 16:10
    background-position: 50% 50%;
    background-repeat: no-repeat;
    background-size: cover;
}

Example in Codepen

or with img elements (in this case your images should have the same dimensions)

Example in Codepen