style.css

body {
  background-color: #171d23;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.container {
  background-color: white;
  width: 400px;
  height: 300px;
  position: relative;
}

.body {
  margin: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  position: absolute;
}

.container * {
  border-radius: var(--r, 0);
  padding: var(--p, 0);
  margin: var(--m, 0);
  position: absolute;
  background: var(--b, #1a4341);
}

.container b {
  --b: #f3ac3c;
  --p: 50px;
  --r: 0 100px 0 0;
  --m: 50px 200px;
}

.container i {
  --b: #998235;
  --p: 75px 37.5px;
  --m: -25px -125px;
  --r: 75px 0 0 75px;
}

.container u {
  --b: #0b2429;
  --p: 15px;
  --r: 50%;
  --m: -45px -7.5px;
}