.calc {
    width: 100%;
    height: 80vh;
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.calc__button {
    width: calc(100% - .50rem);
    margin: .25rem;
    background-color: #8E8E8E;
}

.button {
    width: 100%;
    height: 100%;
    background-color: #5C5C5C;
    color: #C9C9C9;
    font-size: 3rem;
}

.button--clear {
    width: 9%;
    margin-left: 2%;
}