* {
    padding: 0;
    margin: 0;
}

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

#calculator {
    font-family: Arial, sans-serif;
    background-color: #060606;
    border-radius: 15px;
    max-width: 500px;
    overflow: hidden;
    color: white;
}

#display {
    text-align: right;
    width: calc(100% - 40px);
    height: 100px;
    padding: 20px;
    font-size: 5rem;
    border: none;
    background-color:#060606;
    color: white;
}

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

button {
    width: 100px;
    height: 100px;
    border-radius: 50px;
    border: none;
    font-size: 48px;
    cursor: pointer;
}

.misc-button {
    background-color:#a5a5a5;
    color:#060606;
}

.number-button {
    background-color:#333333;
    color:#fcfcfc;
}

.operator-button {
    background-color: #fe9504;
    color: #fefef2;
}

#zero {
    text-align: start;
    width: 200px;
    grid-column: span 2;
    padding-left: 40px;
}

button:hover {
    filter: brightness(150%);
}

button:active {
    filter: brightness(160%);
}

.operator-button:active {
    background-color: #fefef2;
    color:#fe9504
}