style.css

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    max-width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #3498db, #2ecc71);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.calculatrice {
    background-color: #333;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    width: 320px; 
    height: 500px; 
    justify-content: space-between; 
}

.ecran {
    width: 100%;
    height: 80px;
    background-color: #1c1c1c;
    color: #ffffff;
    border-radius: 15px;
    margin-bottom: 20px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 15px;
    font-size: 36px; 
    overflow-x: auto; 
    white-space: nowrap; 
    box-shadow: inset 0px 4px 8px rgba(0, 0, 0, 0.5);
}

.touches {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
}

.button {
    background-color: #444;
    border: none;
    border-radius: 10px;
    font-size: 24px;
    color: #ffffff;
    cursor: pointer;
    padding: 15px;
    transition: background-color 0.2s ease;
    box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.3);
}

.button:hover {
    background-color: #555;
}

.button:active {
    background-color: #666; 
    box-shadow: inset 0px 2px 5px rgba(0, 0, 0, 0.3);
}

.button:focus {
    outline: none;
}
    
.button.c {
    background-color: #e67e22;
    color: #ffffff;
}

.button.c:hover {
    background-color: #d35400; 
}

.button.c:active {
    background-color: #e74c3c; 
}