body { font-family: Arial, sans-serif; margin:0; padding:0; }
nav { display:flex; gap:5px; background:#0d3f5d; color:white; padding:5px; }
nav button { flex:1; padding:10px; color:white; background:#0d3f5d; border:none; cursor:pointer; }
.page { padding:10px; }
.boutons-codes button { margin:5px; padding:10px 15px; font-size:16px; }
#codeAffiche { margin-top:20px; }