JSFiddle - React, Tailwind, and code Playground

HTML

<div id="b1">первый блок</div>
<div id="b2">второй блок</div>

CSS

#b1, #b2 {
    height: 50px;
}

#b1 {
    background:red;
    margin-top: 50px;
}
#b2 {
    background:green;
    margin-top: -100px;
}