/* Style de base pour tous les écrans */
        .btn_ccarton {
            margin: 3px;
            height: 200px;
            width: 200px;
            font-size: 20px !important;
            white-space: normal;
            word-wrap: break-word;
            box-sizing: border-box;
        }

        .ecran {
            background-color: black;
            width: 100%;
            display: inline-block;
            height: 50px;
            color: lime;
            font-weight: bolder;
            text-align: center;
            vertical-align: middle;
            padding: 12px;
            font-size: 25px;
            border-radius: 5px;
            box-sizing: border-box;
        }

        .caisse {
            width: 300px;
        }

        .touche {
            width: 60px;
            height: 60px;
            margin: 5px;
            font-size: 20px;
            border: none;
            border-radius: 50%;
            background-color: #e9ecef;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .touche:hover {
            background-color: #dee2e6;
        }

        .valider {
            background-color: #28a745;
            color: white;
            width: 130px;
            border-radius: 30px;
        }

        .valider:hover {
            background-color: #218838;
        }

        #TEffacer {
            background-color: #dc3545;
            color: white;
            border-radius: 30px;
        }

        #TEffacer:hover {
            background-color: #c82333;
        }

        #AN {
            background-color: #6c757d;
            color: white;
            border-radius: 30px;
        }

        #AN:hover {
            background-color: #5a6268;
        }

        /* Style pour les téléphones portables */
        @media (max-width: 767px) {
            .btn_ccarton {
                height: 60px;
                width: 60px;
                font-size: 11px !important;
            }

            .conteneur {
                display: flex;
                flex-direction: column;
                align-items: center;
            }

            .conteneur-gauche {
                display: flex;
                flex-wrap: wrap;
                justify-content: center;
            }

            .conteneur-droit {
                width: 100%;
                margin-top: 20px;
            }

            .caisse {
                width: 100%;
                display: flex;
                flex-wrap: wrap;
                justify-content: center;
            }
			.touche {
				width: 40px;
				height: 40px;
				margin: 2px;
				font-size: 20px;
				padding: 1em 0.5em;!important;
			}
			.ecran {
				height: 40px;
				padding: 12px;
			}
			.valider {
				width: auto;
			}
			#TEffacer {
				padding: 1em 0.5em;
			}
			#AN {
				padding: 1em 0.5em;
			}
        }

        /* Style pour les tablettes */
        @media (min-width: 768px) and (max-width: 1024px) {
            .conteneur {
                display: flex;
                flex-direction: row;
                flex-wrap: wrap;
            }

            .conteneur-gauche {
                flex: 2;
            }

            .conteneur-droit {
                flex: 1;
                margin-left: 20px;
            }
			.btn_ccarton {
                height: 150px;
                width: 150px;
            }
        }

        /* Style pour les ordinateurs */
        @media (min-width: 1025px) {
            .conteneur {
                display: flex;
                 flex-direction: row;
                flex-wrap: wrap;
            }

            .conteneur-gauche {
                flex: 2;
            }

            .conteneur-droit {
                flex: 1;
                margin-left: 20px;
            }
			.btn_ccarton {
                height: 100px;
                width: 145px;
            }
            .caisse {
                width: 300px;
            }
        }