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

.display {
    width: 80%;
    border: none;
    padding: 40px 0;
    color: white;
    background-color: rgb(31, 27, 27);
    font-size: 60px;
    text-align: right;
    overflow: hidden;
}

.container {
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    min-width: 300px;
    background-color: rgb(31, 27, 27);
    max-width: 400px;
}

.buttons {
    width: 90%;
    min-width: 300px;
    display: grid;
    margin: 10px 0px 60px;
   grid-template-rows: repeat(5, 1fr);
   grid-template-columns: repeat(4, 1fr);
   grid-gap: 10px;
}

.buttons button {
    font-size: 25px;
    background-color: rgb(239, 244, 248);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    width: 80px;
    height: 80px;
}

.buttons button:hover,
.buttons button:focus {
    background: rgb(70, 69, 69);
    color: aliceblue;
}