Tight Corner

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<style>
  body {
    background: #f7f3da;
    display: flex;
    align-content: center;
    flex-wrap: wrap;
    margin: 0;
  }
  div {
    width: 200px;
    height: 40px;
    border-radius: 0 10px 10px 0;
    background: #d25b70;
  }

  div:nth-child(2),
  div:nth-child(3) {
    background: #f7f3da;
    border-radius: 0 0 0 20px;
  }

  div:nth-child(3),
  div:nth-child(4) {
    rotate: 180deg;
  }

  div:nth-child(2) {
    box-shadow: -20px 20px #d25b70;
  }
</style>