:root{
    --btn-shadow: inset 0px 0px 13px 2px black;
}

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    width: 100%;
    height: 100vh;
    display: grid;
    place-items: center;
}
.contenedor{
    width: 60%;
    max-width: 300px;
    min-width:250px ;
    background-color: rgb(35, 35, 35);
    color: rgb(240, 236, 232);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2px;
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}
.pantalla{
    width: 100%;
    height: 100px;
    border-radius: 10px 10px 0px 0px;
    box-shadow:var(--btn-shadow) ;
    text-align: right;
    display: flex;
    padding: 7px;
    justify-content:right;
    align-items: flex-end;
    font-size: 30px;
}
.contenedor_de_teclas{
    width: 100%;
    display: grid;
    gap: 10px;
    padding: 10px;
}
.div_teclas{
    width: 100%;
    display: flex;
   
    justify-content: space-around;
}
.tecla{
    width: 50px ;
    height: 50px;
    display: grid;
    place-items: center;
    box-shadow: var(--btn-shadow);
    border-radius: 4px;
    cursor: pointer;
}

.tecla_naranja{
    background-color: rgb(87, 85, 84);
    font-size: 20px;
}
.expandir{
    width: 43%;
}