If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
As i changed the color of sidebar, it’s height is now clearly visible.
How to make sidebar to be spread on the whole height of the site content, even if there is not enough content on the sidebar…
I made it by
margin:0 15px 40px 0;
padding:0 16px 0px 16px;
but sometimes is to long and sometimes is to short
you can try to use a percentage value instead of pixels (it helps you to adjust the height dynamically). I.e. instead of:
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