body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
}
.calculation {
    max-width: 300px;
    width: 100%;
    height: 300px;
    border-radius: 10px;
    padding: 50px 30px !important;
    overflow: hidden;
    box-shadow: 0 0 20px 5px rgba(0, 0, 0, .1);
    position: relative;
}
.calculation-row {
    display: flex;
    align-items: flex-start;
    position: relative;
}
.values {
    display: flex;
    flex-direction: column;
    row-gap: 4px;
}
.btn-list {
    display: grid;
    grid-template-columns: repeat(4, 68px);
    grid-template-rows: repeat(4, 50px);
    column-gap: 8px;

    & .backspaceBtn {
        grid-row: 1 / 2;
        grid-column: 4 / 5;
    }
    & .percent {
        grid-row: 1 / 2;
        grid-column: 2 / 3;
        font-size: 16px;
    }
    & .division {
        grid-row: 1 / 2;
        grid-column: 3 / 4;
    }
    & .addition {
        padding-top: 8px;
        grid-row: 2 / 3;
        grid-column: 4 / 5;
    }
    & .add {
        grid-row: 3 / 4;
        grid-column: 4 / 5;
    }
    & .subtr {
        grid-row: 4 / 5;
        grid-column: 4 / 5;
    }
}
.numbers {
    display: flex;
    column-gap: 8px;
    flex-wrap: wrap;
    position: absolute;
    top: 50px;
    max-width: 220px;
    row-gap: 10px;
}
.num {
    width: 68px;
}
.equal {
    position: absolute;
    right: 32px;
    width: 222px;
}
.process {
    display: inline-block;
    text-align: right;
    line-height: 40px;
    padding: 0 8px;
    max-width: 100%;
    height: 40px;
    border-radius: 2px;
    margin-bottom: 20px;
    text-align: right;
    overflow: hidden;
    background-color: rgba(0, 0, 0, .1);
}
.btn {
    min-width: 40px;
    height: 40px;
    border: none;
    font-size: 18px;
    border-radius: 2px;
    cursor: pointer;

    &:hover {
        background-color: rgba(0, 0, 0, .1);
    }
}