body {
    font-family: 'Roboto', sans-serif;
    background:   #8aa1e7;
    margin: 0;
    padding: 0;
}

.text-center {
    text-align: center;
    margin-top: 30px;
    font-size: 2rem;
}

.container {
    width: 340px;
    background: #222;
    margin: 30px auto;
    padding: 20px 30px;
    border-radius: 18px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

.input {
    width: 97%;
    padding: 12px 0;
    background: #fff;
    border: none;
    border: 2px solid rgb(116, 29, 29);
    border-radius: 5px;
    margin-bottom: 20px;
    font-size: 1.5rem;
    text-align: right;
}

.row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}

.button {
    width: 65px;
    height: 45px;
    font-size: 1.25rem;
    border: none;
    border-radius: 8px;
    margin: 0 5px;
    cursor: pointer;
    background: #333;
    color: #fff;
    transition: background 0.2s;
}

.button:hover {
    background: #555;
}

#equals {
    background: #00897b;
    color: #fff;
}

#equals:hover {
    background: #00695c;
}

#clear {
    background: #d32f2f;
    color: #fff;
}

#clear:hover {
    background: #b71c1c;
}

/* Utility classes for flex and column alignment */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.item-center {
    align-items: center;
}