*{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

body{
    background-color: #663300;
}

.calculator-body{
    background-color: #000;
    width: 350px;
    height: 550px;
    margin: 40px auto;
    border-radius: 20px;
}

.screen{
    width: 90%;
    height: 20%;
    background-color: rgb(71, 70, 70);
    margin: 0 auto;
    position: relative;
    top: 20px;
    border-radius: 10px;
    display: flex;
    flex-direction: row-reverse;
}

.number{
    color: #fff;
    font-size: 3rem;
    font-family: monospace;
    margin-right: 10px;
    margin-top: 55px;
}

.container{
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    position: relative;
    top: 40px;
    left: 25px;
}

.button {
    background-color: rgb(71, 70, 70);
    width: 67px;
    height: 67px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.button.equals,
.button.plus,
.button.minus,
.button.multiplication,
.button.division{
    background-color: orange;
}

.button.clear,
.button.integer,
.button.percent{
    background-color: grey;
}

span{
    font-family: Arial;
    color: #fff;
    font-size: 2rem;
}

.button:hover{
    transform: scale(1.1);
    cursor: pointer;
    transition: 4ms;
}