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

html,body{
    height: 100%;
}

.container{
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding:0 2%;
}

.flex{
    display:flex;
    flex-wrap: wrap;
    justify-content: center;
}

#display{
    width: 100%;
    height: 40px;
    padding: 0 2%;
    background-color: rgba(180,180,180,0.4);
    margin-top: 10px;
}

.container > span{
    width: 20%;
    margin-left: 2px;
    margin-right: 2px;   
    aspect-ratio:1/1;
    border: 2px solid black;
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    
}