*{
    box-sizing: border-box;
    margin: 0;
}
.process-section {
  position: relative;
  height: 400px;
  background: url('../img/psi.jpg') no-repeat center center;
  background-size: cover;
  display: flex;
  align-items: center;
  color: #fff;
  font-size: 2.5rem;
  font-weight: bold;
  text-align: center;
  z-index: 1;
  overflow: hidden;
}

/* Overlay */
.process-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 0;
}

.process-section span {
    position: relative;
    padding: 60px 0 0 40px;
    font-family: var(--heading-font);
    color: #fff;
    font-size: 2.5rem;
    z-index: 1;
}