#coverimg {
    width: 100%;
    height: 50vh;
    background: url("n2a2NewBldg2.png") center;
    background-size: cover;
    position: relative;
  }
  
  #coverimg:before {
    content: "";
    background: rgba(0, 0, 0, 0.4);
    position: absolute;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
  }
  .caption {
      position: absolute;
      top: 50%;
      left: 18%;
      transform: translate( -50%, -50% );
      text-align: center;
      color: rgb(255, 255, 255);
      font-weight: bold;
  }