button{
    width:100px;
    height:100px;
    border-radius:50px;
    border:none;
    background-color :hsl(0, 0%, 30%);
    color:white;
    font-family: 'DotGothic16', monospace;
    font-size: 2rem;
}

#keys{
    display:grid;
    grid-template-columns:repeat(4, 1fr);
    gap:10px;
    padding:25px;
}

#calculator{
    background-color:hsl(0, 0%, 15%);
    max-width: 500px;
    border-radius: 30px;
    overflow: hidden;

}

#display{
    width: 100%;
    padding:20px;
    border:none;
    text-align: left;
    font-size:5rem;
    background-color: hsl(0, 0%, 25%);
    color: white;
}

body{
margin:0;
display:flex;
justify-content:center;
align-items:center;
height:100vh;
background-color:rgb(160, 157, 157);
}

button:hover{
    background-color: hsl(0, 0%, 5%);
}
button:active{
    background-color: hsl(71, 94%, 45%);
}