/*.carousel-inner>.item>a>img, .carousel-inner>.item>img, .img-responsive, .thumbnail a>img, .thumbnail>img {
  height: 250px;
}*/

.portfolio-fix {
  height: 250px;
}

.portfolio-fix {
  height: 250px;
}

.navbar {
  background: rgba(0,0,0,0.3);
}

header {
  height: 100vh;
}

Add transparent navbar and change height of header
Add transparent navbar and change height of header
