body { 
    font-family: Arial, sans-serif; 
    margin:0; 
    padding:10px; 
    background:#f5f5f5;
}

.large{
    
    max-width: 600px;
    margin: auto;
}
.materiaux {
	
    border-radius: 25px;
    border: 1px solid ;
    max-width: 95%;
    padding-top: 40px;
    padding-bottom:20px;
    margin:  auto; 
    margin-top: 10px;  
    margin-bottom: 10px;
    color: #000;
    text-align: center;    
    box-sizing: border-box;        
    height: auto;
    width: auto;
}

 .titre-page {
    font-size: 1.7rem;
  }

  .liste-boutons {
        
      /*flex-direction: column; met les boutons en colonne*/
      gap: 15px;
      margin-bottom: 40px;
      /*align-items: center;    centre les boutons horizontalement */
  
}

.btn-orange {
    min-width: 250px;
    max-height: 20px;
    display: inline-block;
    padding: 10px 22px;
    border-radius: 10px;
    border: solid 1px;
    margin-left: 10px;
    margin-top: 5px;
    background: linear-gradient(
      to bottom,
      #0077FF, /* Bleu azur profond */
      #3399FF, /* Bleu azur */
      #66BFFF, /* Bleu ciel */
      #99D8FF, /* Bleu très clair */
      #CCEFFF, /* Bleu pastel */
      #FFFFFF  50%/* Blanc */
);
    color: #000;
    text-decoration: none;
    font-weight: bold;    
    font-size: 1rem;
}
.btn-orange:hover {
    color: red;
    transform: scale(1.03);
}