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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #000;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.calculator {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.display {
    background-color: #1C1C1C;
    color: white;
    font-size: 64px;
    text-align: right;
    padding: 20px;
    flex: 0 0 33.333%;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
    flex: 1;
    gap: 1px;
}

button {
    border: none;
    font-size: 24px;
    color: white;
    cursor: pointer;
}

.function {
    background-color: #A5A5A5;
    color: black;
}

.operator {
    background-color: #FF9500;
}

button:not(.function):not(.operator) {
    background-color: #333333;
}

.zero {
    grid-column: span 2;
}

.equals {
    grid-column: 4;
    grid-row: 5;
}

.seo{
    display: none;
}