.container {
    display: flex;
    flex-direction: column;
    width: 400px;
    height: auto;
}

.display {
    height: auto;
    min-height: 150px;
    background-color: green;
    width: 100%;
    font-size: 50px;
    word-wrap: break-word;
    text-align: right;
    padding: 10px;
    box-sizing: border-box;
    user-select: none;
}

.buttons {

    display: grid;
    grid-template-columns: auto auto auto;
}

.buttons button {
    height: 50px;
}

button:hover {
    cursor: pointer;
}