html {
  height: 100%;
  width: 100%;
  background-image : url("image1.jpg")
}

.text_bienvenue{
  text-align: center;
  margin-top: 50px;
  font-family: Arial, sans-serif;
  color: #333;
  padding: 20px;
}

.image{
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 500%;
  height: auto;
  border-radius: 10px;
}