body, html{
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
}
.container{
    height: 100vh;
    display: flex;
    justify-content: center;
}
.calculator{
    width: 400px;
    height: 600px;
    background-color: black;
    border-radius: 10px;
}
#display{
    background-color: black;
    border-radius: 10px;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
    font-size: xx-large;
}
.buttons{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    padding: 10px;
    gap: 5px;
}
button{
    height: 90px;
    width: 90px;
    border-radius: 50%;
    cursor: pointer;
    background-color: rgb(57, 57, 57);
    color: white;
    font-size: xx-large;
    border: none;
}
button:hover{
    background-color: grey;
}
button:active{
    transition: 10ms;
    background-color: rgb(57, 57, 57);
}
.orange{
    background-color: orange;
    border-radius: 50%;
}
.orange:hover{
    background-color: rgb(255, 206, 115);
}
.orange:active{
    transition: 10ms;
    background-color: orange;
}
.grey{
    background-color: grey;
}
.grey:hover{
    background-color: rgb(170, 170, 170);
}
.grey:active{
    transition: 10ms;
    background-color: grey;
}