<div class="box"></div>
<div class="box box_second">
  <div class="box__content">
    <div class="box__item"></div>
    <div class="box__item"></div>
  </div>
</div>

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

.box {
  min-height: 50vh;
}

.box_second {
  background-color: orange;
  overflow: hidden;
  position: relative;
  z-index: 0;
}

.box_second:before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 50%;
  transform: translateY(-50%);
  z-index: 0;
  overflow: hidden;
  background-color: #fff;
  border-radius: 50%;
}

.box__content {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
}

.box__item {
  width: 40%;
  height: 100px;
  background-color: rgb(43, 32, 32);
  margin: 20px;
}