body {
    margin: 0px;
    padding: 0px;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
}

.calculator {
    width: 100%;
    max-width: 550px;  /* Set max-width to keep it from being too wide */
    height: auto;
    background: #fff;
    border: 10px solid #7643FF;
    border-radius: 10px;
    padding: 20px;
    box-sizing: border-box;
    font-weight: bold;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    margin: 20px;
}

.display {
    width: 100%;
    height: 50px;
    font-size: 1.5em;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 5px;
    border: 2px solid #7643FF;
    box-sizing: border-box;
    text-align: left;
    color: #000000;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    width: 100%;
    grid-template-rows: repeat(5, 1fr);
    overflow: hidden;
}

.buttons input[type="button"] {
    padding: 10px;
    font-size: 1.2em;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    background-color: #7643FF;
    color: #FFFFFF;
    cursor: pointer;
    transition: 0.2s ease-in-out;
}

.buttons input[type="button"]:hover {
    background-color: rgba(118, 67, 255, 0.9);
}

@media (max-width: 500px) {
    .calculator {
        padding: 15px;
    }

    .display {
        font-size: 1.2em;
        height: 40px;
    }

    .buttons {
        grid-template-columns: repeat(4, 1fr);
    }

    .buttons input[type="button"] {
        padding: 8px;
        font-size: 1.1em;
    }
}

@media (max-width: 350px) {
    .calculator {
        padding: 10px;
    }

    .display {
        font-size: 1.1em;
        height: 35px;
    }

    .buttons {
        grid-template-columns: repeat(4, 1fr);
    }

    .buttons input[type="button"] {
        padding: 6px;
        font-size: 1em;
    }
}

.display:focus {
    outline: none;
    border-color: #7643FF;
    box-shadow: none;
}