body {
    height: 100vh;
    background-color: rgb(0, 25, 54);
    font-family: Arial, sans-serif;
}

h1 {
    color: white;
    font-family: 'Courier New', Courier, monospace;
    text-align: center;
    margin-bottom: 100px;
}

.calccontainer {
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator {
    background: #fff;
    border-radius: 10px;
    box-shadow: 10px 10px 30px rgb(56, 56, 56);
    overflow: hidden;
    border: 4px solid black;
}

.calculator__display {
    background: #222;
    color: #fff;
    font-size: 2em;
    padding: 20px;
    text-align: right;
}

.calculator__keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
}

button {
    background: #e0e1e6;
    border: none;
    padding: 20px;
    font-size: 1.5em;
    transition: background 0.2s;
}

button:active {
    background: #ccc;
}

.key--operator {
    background: #f59e0b;
    color: white;
}

.key--equals {
    background: #3b82f6;
    color: white;
}

.key--clear {
    background: #ef4444;
    color: white;
}