JSFiddle - React, Tailwind, and code Playground

by vals

HTML

<div class="base">
<div class="rotated">
<div class="inner"></div>
</div>
</div>

CSS

body {
    height: 100%;
    width: 100%;
    background: repeating-linear-gradient(0deg,white 0px, lightblue 100px);
    background-size: 100px 100px;
}

.base {
   position: absolute;
   width: 400px;
   height: 300px;
   left: 100px;
   top: 150px;
   overflow: hidden;
}

.rotated {
    position: absolute;
    width: 200%;
    height: 200%;
    right: 0px;
    bottom: 0px;
    border: solid 1px green;
    overflow: hidden;
    -webkit-transform-origin: 100% 325px;
    transform-origin: 100% 325px;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

.inner {
    position: absolute;
    width: 396px;
    height: 297px;
    right: 0px;
    bottom: 0px;
    border: solid 1px green;
    background-color: rgba(255, 252, 192, 0.52);
    -webkit-transform-origin: 100% 24px;
    transform-origin: 100% 24px;
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}