* {
    font-family: 'Courier New', Courier, monospace;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: radial-gradient(circle, #a4a4a4 10%, #3d3d3d 100%);
    color: white;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #525252;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.3);
}

#numbers, #operators {
    display: grid;
    gap: 10px;
    width: 100%; 
}

#numbers {
    grid-template-columns: repeat(3, 1fr);
}


#operators {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    justify-content: center;
    align-items: center;
    margin: 10px 0px;
}

#operators button {
    background: linear-gradient(145deg, #ff8c00, #ff5f00);
    color: white;
    font-size: 1.5rem;
    height: 70px; 
    width: 100%; 
    border-radius: 10px;
}

#operators button:hover {
    background: linear-gradient(145deg, #ffa500, #ff7f00);
}

button {
    height: 60px;
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    background: linear-gradient(145deg, #2a2a2a, #1c1c1c);
    color: #ffffff;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease-in-out;
}

button:hover {
    background: linear-gradient(145deg, #3a3a3a, #2a2a2a);
    transform: scale(1.05);
}

button:active {
    transform: scale(0.95);
}

#numbers button {
    width: calc(100% - 5px);
}

#operators button {
    width: calc(100% - 5px);
}

input {
    width: 100%;
    height: 60px;
    text-align: right;
    padding: 10px;
    font-size: 2rem;
    font-family: 'Courier New', Courier, monospace;
    background: #000;
    color: #0f0;
    border: 2px solid #444;
    border-radius: 10px;
    box-shadow: inset 2px 2px 5px rgba(0, 0, 0, 0.3);
    margin-top: 10px;
}