h3 {
  margin-top: 5;
  margin-bottom: 100px;
  font-weight: 200;
  font-size: 15px;
}
img {
    width: 800px;
    max-height: 400px;
}

h1 {
  font-weight: 600;
  font-size: 50px;
  margin-bottom: 0;
}

body {
  font-family:'Univers',serif;
  text-align: center;
  margin-left: 50px;
  margin-top: 100px;
}
.box {
  display: block;
  position: relative;
  float: center;
  width: 800px;
  height: 400px;
  margin: auto;
  padding-top: 40px;
}

.b {
  position: absolute;
  display: block;
  opacity: 0.0;
  text-align: center;
  z-index: 10;
  top: 0%;
  width: 800px;
  height: 400px;
  padding-top: 30%;
  color: white;
}

.c {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 0;
}

.a {
  margin-top: 0;
  font-family: sans-serif;
  font-size: 15px;
  font-weight: 200;
}

.box:hover .b{
  opacity: 1;
  transition: opacity 0.5s;
}