body {
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    background-color: black;
    color: white;
}

button {
height: 100px;
width: 100px;
font-size: 30px;
border-radius: 50px;
margin: 20px 10px 0 10px;
}

#scritto {
    font-size: 50px;
    width: 300px;
    border-radius: 50px;
    padding-left: 30px;

}

.txt {
    margin-top: 20px;
    margin-bottom: 10px;
    display: flex;
 
}

#uguale {
    background-color: yellowgreen;
}

#cancella {
    background-color: darksalmon;
}

.save {
    font-size: 18px;
    width: 175px;
}

.operazione {
    background-color:darkkhaki;
}

.container {
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.box {
    display: flex;
    flex: 0 1 30%;
    flex-wrap: wrap;
    justify-content: center;
    width: 300px;
    margin: 0 400px 0 400px;
    
}

.r1, .r2, .r3, .r4, .r5 {
    display: flex;
    width: 100%;
    justify-content: center;
        
}