body, html{
    margin: 0px;
    padding: 0px;
    background-color: aqua;
    height: 100%;
}

header{
    height: 15%;
    display: flex;
    text-align: center;
    align-items: center;
    background-color: grey;
    box-shadow: 1px 1px 10px 1px black;
}

h1{
    width: 100%;
    padding: 0px;
    margin: 0px;
}

#logo{
    position: fixed;
    height: 80px;
}

#numero{
    height: 40%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
}

#box-tasti{
    height: 45%;
    display: flex;
    align-items: center;
    justify-content: center;
}

button{
    cursor: pointer;
    padding: 30px;
    margin: 5px;
    font-size: xx-large;
    border-radius: 7px;
}

/* schermi piccoli */
@media screen and (max-width: 620px){
    button{
        padding: 13px;
        margin: 2px;
        font-size: x-large;
    }
}