I would like to change the background color of the bootstrap theme. This background: To change the background of the first image, change the background property of body element in index.php
body {
width: 100%;
height: 100%;
font-family: 'Open Sans', sans-serif;
background: red; // here
}
To change the background of the second image,in sb-admin-2.css
.bg-gradient-info {
background-color: red; //here, you can override this class
}