*{
    padding:0;
    margin:0;
    box-sizing: border-box;
    font-family: sans-serif;
}

body{
    display:flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.buttons{
    padding: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

button{
    font-size: 2em;
    width: 20%;
    aspect-ratio: 1/1;
    padding: 10px;
    border-radius: 10px;
}

button:hover{
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

.container{
    display:flex;
    flex-direction: column;
    align-items: center;
    border: 5px solid black;
    border-radius: 10px;
    padding: 10px;
    max-width: 500px;
}

.display{
    border: 3px solid black;
    padding: 10px;
    font-size: 3em;
    border-radius: 10px;
    height: 3em;
    width: 8em;
    display: flex;
    align-items: center;
    justify-content: end;
    overflow-x: auto;
}