.headtext{

    margin-top: 50px;
    color: rgb(0, 0, 0);
    opacity: 0.5;
    text-align: center;
    font-size: 3rem;
}

#imggroup img:hover{

    opacity: 0.7;

}

.full-screen-image{
    background: url('images/bgg.png') center/cover no-repeat;
    height: 100vh;
  }