.calculator{
    border:1px solid rgb(187,183,183);
    border-radius: 5px;
    width: 200px;   
}
.display{
    margin: 10px;
    width:85%;
    font-size: 20px
} 
.button-container{
    display:flex;
    justify-content: center;
    flex-wrap: wrap;
}
.button{
    width:60px;
    height:50px;
}