Absolutely postioned div moving with margin top of another static postioned div - html

Question

I have a body containing two div's one is an absolutely positioned div and another one is a static default positioned div, i want the absolutely positioned div to take the full height of the screen which it takes but the problem that next arises is when i try to apply margin top to the statically positioned div, it also gets added to the absolutely positioned div.
How can I make the absolutely positioned div not get the margin of the sibling div ?
body {
font-family: sans-serif;
margin: 0;
padding: 0;
position: relative;
}
.div-1 {
position: absolute;
border: 2px solid red;
width: 90%;
left: 0;
right: 0;
margin: 0 auto;
height: 100vh;
}
.div-2 {
height: 200px;
width: 90%;
background-color: blueviolet;
margin-top: 8rem;
}
<div class="div-1"></div>
<div class="div-2"></div>

Answer 1

The issue is that you have margin collapse on the body element. Margin collapse happens when there's no content separating parent and descendants elements (such as the body and .div-2). You can easily fix this by setting the display property of the body element to flow-root.
body {
font-family: sans-serif;
margin: 0;
padding: 0;
position: relative;
/* Set flow-root */
display: flow-root;
}
.div-1 {
position: absolute;
border: 2px solid red;
width: 90%;
left: 0;
right: 0;
margin: 0 auto;
height: 100vh;
}
.div-2 {
height: 200px;
width: 90%;
background-color: blueviolet;
margin-top: 8rem;
}
<div class="div-1"></div>
<div class="div-2"></div>

Answer 2

body {
font-family: sans-serif;
margin: 0;
padding: 0;
position: relative;
}
.div-1 {
position: absolute;
border: 2px solid red;
width: 90%;
left: 0;
right: 0;
margin: 0 auto;
height: 100vh;
z-index:1;
}
.div-2 {
height: 200px;
width: 90%;
background-color: blueviolet;
top: 8rem;
position: inherit;
}
Use top and position inherit instead of margin-top, check if it can be use.