CSS3/HTML animate position:fixed div onto page - html

Question

I have a little pseudo modal I am building for my app that takes over the screen for a moment when a user clicks the button. I have it set as position fixed so it can overtake the entire screen infront of the user. I have it show and hiding right now with just toggling between display: block and display: none, my css right now just looks like so :
(SCSS) :
.sort-fullscreen {
display: none;
top: 0;
left: 0;
right: 0;
height: 100vh;
width: 100vw;
background-color: $modal-bg-color;
position: fixed;
z-index: 101;
transition: all 0.5;
&.open {
display: block;
}
}
And there is just a
<div class="sort-fullscreen">
... users content
</div>
Sitting at the bottom of my page.
So this works fine, however I am trying to figure out if there is a way to animate the position fixed coming onto the page - perhaps sliding on and off?
Initially - I tried something like this
.sort-fullscreen {
display: block;
top: 0;
left: -100%;
right: 0;
height: 100vh;
width: 100vw;
background-color: $modal-bg-color;
position: fixed;
z-index: 101;
transition: all 0.5;
&.open {
left: 0%;
}
}
However, this does not seem to work for me. I cannot seem to find a clean way to animate a position fixed onto the page. Any help on how to achieve this would be appreciated. Thanks!

Answer 1

Your code seemed to work for me, albeit after adding 's' in your transition time:
transition: all 0.5s;
Fiddle: https://jsfiddle.net/dt2j6872/1/