.page-centree {
  text-align: center;   
}
body {
  background-color:beige;
  .entete {
  display: flex;                     
  justify-content: space-between;    
  align-items: center;               
  padding: 20px 40px;
  background-color: #f5f5f5;         
}
.image-cote {
  width: 200px;                      
  height: auto;
  border-radius: 10px;               
}
.entete h1 {
  flex: 1;                           
  text-align: center;                
  font-size: 2em;
  color: #222;
}

 h1 {font-size: 2.5em;
  text-align: center;
  background: linear-gradient(to right, green, red);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
 }

 p {
  font-family: verdana;
  font-size: 20px;
  color: black;
 }
h3 {
  font-size: 22px;
  text-align: center;
color:red
}
h7 {
  font-size: 22px;
  text-align: center;
color:green
}
.souligne {
  text-decoration: underline;
}