*{
    margin: 0;
    padding: 0;
}

body{
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f2f2f2;
}

.calculadora{
    background: #000000; 
    padding: 20px;border-radius: 10px;
    box-shadow: 0 5px 10px rgba(0,0,0,0.3);
}

#pantalla{
    width: 100%;
    height: 50px;
    font-size: 1.5em;
    margin-bottom: 10px;
    text-align: right;
    border: none;
    outline: none;
    background: #264653;
    color: #fff;
    border-radius: 5px;
}

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

.btn{
    padding: 15px;
    font-size: 1.2em;
    border: none;
    border-radius: 5px;
    background: #FFFFFF;
    cursor: pointer;
}

button:hover{
    background: #f4a26a;
    color: #fff;
}