background gradient not displaying properly with bootstrap 3 - html

Question

When I add a background color gradient to my web page, it works fine up until the end of the last container in my body element. After that, the gradient stops working and you see a distinct contrast between the end of the container and the rest of the empty page.
To see for yourself:
Download the default web page from layoutit.com and edit css/style.css with:
body {
background: #1e5799; /* Old browsers */
background: -moz-linear-gradient(top, #1e5799 0%, #207cca 30%, #2989d8 50%, #7db9e8 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#1e5799), color-stop(30%,#207cca), color-stop(50%,#2989d8), color-stop(100%,#7db9e8)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #1e5799 0%,#207cca 30%,#2989d8 50%,#7db9e8 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #1e5799 0%,#207cca 30%,#2989d8 50%,#7db9e8 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, #1e5799 0%,#207cca 30%,#2989d8 50%,#7db9e8 100%); /* IE10+ */
background: linear-gradient(to bottom, #1e5799 0%,#207cca 30%,#2989d8 50%,#7db9e8 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#7db9e8',GradientType=0 ); /* IE6-9 */
}
The css was generated by http://www.colorzilla.com/gradient-editor/ , so I'm fairly certain it works because it seems to be the popular choice for making a gradient and it works on a non bootstrap page.
Any ideas on how to get the gradient to render through the whole page?
Edit
View an example at http://theshachar.com/so/
Thanks!

Answer 1

Based on your edit, the issue is that the background wasn't extending to the window height.
To solve this, simply add:
html, body {
height:100%;
}
Alternatively, you could also use viewport-percentage units like vw:
body {
height: 100vh;
}
you can also set a min-height:
body {
min-height: 100vh;
}