style.css

body,
html {
  margin: 0;
  height: 100%;
  font-family: 'Roboto, Condensed', sans-serif;
  line-height: 180%;
  text-align: center;
  color: #444;
}

.image1 {
  background-image: url(images/braden.jpg);
  min-height: 100%;
}
.image2 {
  background-image: url(images/leafar.jpg);
  min-height: 60%;
}
.image3 {
  background-image: url(images/nicolas.jpg);
  min-height: 40%;
}
.image4 {
  background-image: url(images/rafael.jpg);
  min-height: 100%;
}

.image1,
.image2,
.image3,
.image4 {
  position: relative;
  opacity: 0.75;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.demonstration {
  color: #fbfbfb;
  font-size: 550%;
  top: 50%;
}
.demonstration2 {
  color: #c73256;
  font-size: 450%;
  top: 57%;
}
.demonstration3 {
  color: #d1345b;
  font-size: 350%;
  top: 64%;
}
.demonstration4 {
  color: #fff;
  font-size: 250%;
  top: 45%;
}
.demonstration, .demonstration2,
.demonstration3,
.demonstration4 {
  position: absolute;
  width: 100%;
  text-transform: uppercase;
  letter-spacing: 8px;
  text-shadow: 0 0 10px #000;
}

section {
  padding: 50px ;
  
}
.Dark {
  background-color: #444;
  color: #fff;
}

@media (max-width: 768px) {
  .demonstration {
    font-size: 300%;
  }
  .demonstration2 {
    font-size: 250%;
  }
  .demonstration3 {
    font-size: 200%;
  }
}

p{
  text-align: justify;
}