html {
    text-align: center;
    font-family: monospace;
}

.calculator {
    display: flex;
    min-height: 95vh;
    justify-content: center;
    align-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    background-color: lightgoldenrodyellow;
}

.container {
    background-color: black;
    border: 10px solid rgba(47,47,47,1);
    border-radius: 4px;
    display: grid;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: minmax(100px, auto) repeat(5, 80px);
    gap: 2px;
}

#display {
    grid-column: 1 / -1;
    background-color: white;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: flex-end;
    padding: 5px;
    font-size: 5.5em;
    font-weight: initial;
    text-shadow: 1.3px 1.3px #383838;
    margin: 5px;
    color: black;
}

button {
    margin: 1px;
    border-radius: 5%;
    border: none;
    font-weight: initial;
    font-size: 2em;
    font-family: monospace;
    color: black;
}

#zero {
    grid-column: span 2;
}

.backspace {
    grid-column: span 2;
}

.operator {
    background-color: lightblue;    
}

.operator:focus {
    background-color: hsl(195, 53%, 89%);
}

.equals {
    background-color: lightblue;
}

.equals:active {
    background-color: hsl(195, 53%, 89%);
}

.digit {
    background-color: lightgreen;
}

.digit:active {
    background-color: hsl(120, 73%, 85%);
}

.decimal {
    background-color: lightgreen;
}

.decimal:active {
    background-color: hsl(120, 73%, 85%);
}

.clear {
    background-color: lightcoral;
}

.clear:active {
    background-color: hsl(0, 79%, 82%);
}

.backspace {
    background-color: lightcoral;
}

.backspace:active {
    background-color: hsl(0, 79%, 82%);
}