JSFiddle - React, Tailwind, and code Playground

by DeadByElpy

HTML

<div class="wrap">960px<div class="beyond_boundaries">100%</div></div>

CSS

.wrap {
    width: 300px;
    height: 1000px;
    background: #C9F1FD;
    margin: 0 auto;
}
.beyond_boundaries {
    /* top - сколько нужен отступ сверху */
    top: 300px;
    width: 100%;
    background: #4DD7FB;
    height: 100px;
    position: absolute;
    left: 0px;
}