main {
    height: 100vh;
    display: grid;
    place-items: center;
}

.calculator {
    background: #edebeb;
    padding: 26px;
}

input {
    height: 44px;
    width: 260px;
    font-size: 22px;
}

.button-box {
    display: grid;
    grid-template-columns: 60px 60px 60px 60px;
    grid-template-rows: 40px 40px 40px 40px 40px;
    grid-gap: 9px;
    margin-top: 12px;
}

button {
    font-size: large;
    background: #d6d6d6;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: rgb(173, 169, 169);
}

.equal {
    background: orange;
}

.equal:hover {
    background: orange;
}