flexbox align items shifted from center without fillers - css

Question

Centering a flex item is easy. However I like to shift it upwards a bit so that the the relation between the upper and lower space is e. g. 1/2. Easy too when using fillers. But is there a way to do this whithout fillers?
HTML:
<div id="filler-top"></div>
<div id="the-item">
</div>
<div id="filler-bottom"></div>
CSS:
#the-item {
width: 80vw;
height: 30vh;
border: 2px solid lightblue;
}
body {
height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-between;
}
#filler-top {
width: 100%;
flex: 1;
}
#filler-bottom {
width: 100%;
flex: 2;
}
https://jsfiddle.net/Sempervivum/b2wotc8e/3/
Applying margin-top and margin-bottom doesn't work as a percentage is relative to the width.

Answer 1

instead of adding 2 elements to the markup, you can use :before and :after pseudo-elements:
#the-item {
width: 80vw;
height: 30vh;
border: 2px solid lightblue;
}
body {
height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-between;
}
body:before {
content: "";
width: 100%;
flex: 1;
}
body:after {
content: "";
width: 100%;
flex: 2;
}
<div id="the-item"></div>
Another option is to simply use a mixture of position:relative, top and transform:
#the-item {
width: 80vw;
height: 30vh;
border: 2px solid lightblue;
position: relative;
top: 33.333%;
transform: translateY(-33.333%);
}
body {
height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-between;
}
<div id="the-item"></div>