body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #3a0000, #920000);
    font-family: 'Brush Script MT', cursive;
}
.github-link {
    position: absolute;
    top: 1rem;
    right: 1rem;
    text-decoration: none;
    color: #ff0000;
    font-weight: bold;
    background-color: #000000;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s, color 0.3s;
}
.input-field {
    padding: 0.5rem;
    font-size: 1rem;
    max-width: 200px;
    margin-right: 1rem;
    border: 1px solid #000000;
    border-radius: 5px;
}
.container {
    border-inline-color: rgb(0, 0, 0);
    border : 2px solid rgb(0, 0, 0);
    text-align: center;
    background-color: rgb(255, 0, 0);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 10px rgb(80, 0, 0);
}

.display {
    font-size: 4rem;
    margin: 1rem 0;
    padding: 1rem;
    min-width: 200px;
    font-weight: bold;
}

.buttons {
    display: grid;
    gap: 1rem;
    justify-content: center;
    grid-template-columns: repeat(2, 1fr);
}

button {
    padding: 0.5rem 1rem;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: #000000;
    color: rgb(255, 255, 255);
    transition: background-color 0.3s;
}

button:hover {
    background-color: #350000;
}

.positive {
    color: rgb(0, 73, 0);
}

.negative {
    color: rgb(5, 0, 54);
}

.zero {
    color: black;
}