<section class="section">
  <div class="section__container container">
    <div class="section__inner">
      <div class="section__content">
        Lorem ipsum dolor sit amet consectetur adipisicing elit
      </div>
      <div class="section__image"></div>
    </div>
  </div>
</section>

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: sans-serif;
  line-height: 1.4;
}

.container {
  max-width: 768px;
  padding: 0 15px;
  margin: 0 auto;
}

.section {
  background: radial-gradient(circle at 60% 30%, #eae5f3, #4f475d);
  overflow: hidden;
}

.section::after {
  content: '';
  display: block;
  height: 50px;
  background-color: #673ab7;
}

.section__inner {
  padding-top: 1px;
  margin-top: 36%;
  position: relative;
  z-index: 0;
}

.section__inner::before {
  content: '';
  position: absolute;
  left: 40%;
  bottom: 0;
  width: calc(60% + 50vw - 50%);
  height: 37%;
  background: linear-gradient(to top right, #673ab7 calc(50% - 0.5px), transparent calc(50% + 0.5px));
  z-index: 2;
}

.section__inner::after {
  content: '';
  position: absolute;
  top: 0;
  right: 100%;
  width: calc(50vw - 50%);
  height: 100%;
  background-color: #673ab7;
}

.section__content {
  position: absolute;
  padding: 25px 10% 0 0;
  top: 0;
  left: 0;
  width: 40%;
  height: 100%;
  background-color: #673ab7;
  color: #fff;
  border-radius: 0 30px 0 0;
}

.section__image {
  position: relative;
  width: 60%;
  margin-left: 30%;
  margin-top: -36%;
  z-index: 1;
}

.section__image::before {
  content: '';
  display: block;
  padding-bottom: 131%;
  width: 100%;
  background: url('https://gocatgosf.com/wp-content/uploads/purrvana_cat.png') no-repeat 0 0 / contain;
}