body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

h1 {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 120px;
  text-align: center;
  color: #363636;
  width: 100%;
}
.section {
  height: 100vh;
  width: 100%;
  position: relative;
}

.s1 {
  background: url("../imagesdecoratives/morrocoplaces.jpg");
  background-size: cover;
  background-position: 0 0;
  background-repeat: repeat;
  background-attachment: fixed;
}
.s2 {
  background: url("../imagesdecoratives/angola.jpg");
  background-size: cover;
  background-position: 0 0;
  background-repeat: repeat;
  background-attachment: fixed;
}
.s3 {
  background: url("../imagesdecoratives/johannesburg-street.webp");
  background-size: cover;
  background-position: 0 0;
  background-repeat: repeat;
  background-attachment: fixed;
}
.s4 {
  background: url("../imagesdecoratives/Nairobi-City.jpg");
  background-size: cover;
  background-position: 0 0;
  background-repeat: repeat;
  background-attachment: fixed;
}
.blocTxt {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 300px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 5px;
}
.sousTitreTxt {
  font-size: 45px;
  text-align: center;
}
.txt {
  font-size: 18px;
  padding: 10px 40px;
}