<section class="block">
  <div class="container">
    <div class="col">
      <div class="content">1</div>
    </div>
    <div class="col">
      <div class="content">2</div>
    </div>
    <div class="col">
      <div class="content">3</div>
    </div>
  </div>
</section>

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.block {
  background: url("https://images.unsplash.com/photo-1494256997604-768d1f608cac?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=801&q=80")
    no-repeat center / cover;
  min-height: 80vh;
  height: 1px;
}

.container {
  display: flex;
  max-width: 640px;
  height: 100%;
  margin: 0 auto;
}

.col {
  flex: 1;
  height: 100%;
  text-align: center;
  padding-top: 25px;
  padding-bottom: 25px;
  overflow: hidden;
}

.col:nth-child(1) {
  margin-left: calc(50% - 50vw);
  padding-left: calc(50vw - 50%);
}

.col:nth-child(2) {
  flex: 0 0 33.3%;
  padding-top: 100px;
}

.col:nth-child(3) {
  margin-right: calc(50% - 50vw);
  padding-right: calc(50vw - 50%);
}

.content {
  height: 100%;
  border: 10px solid transparent;
  box-shadow: 0 0 0 100vmax rgba(0, 0, 0, 0.75);
  background-color: rgba(0, 0, 0, 0.75);
  background-clip: padding-box;
  color: #fff;
}