How To Fix a Full-Screen Responsive Background Image That Gets Cropped?

Full-screen Responsive Background Image

Creating a full-screen responsive background image is an essential skill in modern web design. In this guide, we will troubleshoot an issue with a fullscreen background image and explore alternative solutions.

Troubled Code

<div class="main-header">
  <div class="row">
    <div class="large-6 large-offset-6 columns">
      <h1>BleepBleeps</h1>
      <h3>A family of little friends<br>that make parenting easier</h3>
    </div>
  </div>
</div>

.main-header {
  background-image: url(../img/bb-background2.png);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  width: 100%;
  height: 100%;
}

Problem Analysis

The provided code uses the background-size: cover property, which scales the image to cover the container. However, it crops the image off-screen, resulting in an incomplete display.

Alternative Solutions

1. Absolute Positioning with CSS

#bg {
  position: fixed;
  top: 0;
  left: 0;
  min-width: 100%;
  min-height: 100%;
}

2. Proportional Scaling with CSS Media Queries

.bg {
  min-height: 100%;
  max-width: 1024px;
  width: 100%;
  height: auto;
  position: fixed;
  top: 0;
  left: 0;
}

@media screen and (max-width: 1024px) {
  .bg {
    left: 50%;
    margin-left: -512px;
  }
}

3. jQuery Resize Listener

$(window).load(function() {
  var $bg = $("#bg");
  var aspectRatio = $bg.width() / $bg.height();

  function resizeBg() {
    if ((theWindow.width() / theWindow.height()) < aspectRatio) {
      $bg.addClass('bgheight');
    } else {
      $bg.addClass('bgwidth');
    }
  }

  theWindow.resize(resizeBg).trigger("resize");
});

Overcoming Mobile Display Challenges

To allow div> to sit above the fullscreen image on mobile, consider using Flexbox or CSS Grid and absolute positioning.

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