* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

/* Viewport size for mobile */
@media (max-width: 599px) {
    body {
        display: flex;
        flex-direction: column;
        align-items: center;
        background-color: #f4f4f4;
    }

    .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        height: 400px;
        width: 340px;
        border-radius: 15px;
    }

    label {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 25px;
        font-weight: bold;
    }

    input {
        -webkit-appearance: none;
        padding: 10px;
        border-radius: 10px;
        border: none;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        background-color: #fff;
        height: 50px;
        width: 300px;
        color: #000;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 23px;
        font-weight: bold;
        font-style: italic;
    }

    .input-container {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    h1 {
        width: 280px;
        text-align: center;
        font-family:Verdana, Geneva, Tahoma, sans-serif;
        font-style: italic;
        margin-top: 20px;
        margin-bottom: 20px;
        font-size: 25px;
    }

    .calculateButton {
        -webkit-appearance: none;
        margin-top: -8px;
        width: 180px;
        height: 50px;
        border-radius: 10px;
        border: none;
        background-color: rgb(194, 233, 255);
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        font-size: 22px;
        letter-spacing: 1.5px;
        color: #000;
    }

    .clearButton {
        -webkit-appearance: none;
        width: 90px;
        height: 30px;
        border-radius: 5px;
        border: none;
        background-color: #e5e5e5;
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        color: #000;
        font-size: 14px;
        margin-top: -15px;
    }

    #result {
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        font-size: 25px;
        margin-top: 33px;
        text-align: center;
        width: 320px;
        line-height: 35px;
    }
}

/* Viewport size for tablets */
@media (min-width: 600px) and (max-width: 1279px) {
    body {
        display: flex;
        flex-direction: column;
        align-items: center;
        background-color: #f4f4f4;
    }

    .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        height: 400px;
        width: 340px;
        border-radius: 15px;
    }

    label {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 25px;
        font-weight: bold;
    }

    input {
        -webkit-appearance: none;
        padding: 10px;
        border-radius: 10px;
        border: none;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        background-color: #fff;
        height: 50px;
        width: 300px;
        color: #000;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 23px;
        font-weight: bold;
        font-style: italic;
    }

    .input-container {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    h1 {
        width: 280px;
        text-align: center;
        font-family:Verdana, Geneva, Tahoma, sans-serif;
        font-style: italic;
        margin-top: 20px;
        margin-bottom: 20px;
        font-size: 25px;
    }

    .calculateButton {
        -webkit-appearance: none;
        margin-top: -8px;
        width: 180px;
        height: 50px;
        border-radius: 10px;
        border: none;
        background-color: rgb(194, 233, 255);
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        font-size: 22px;
        letter-spacing: 1.5px;
        color: #000;
    }

    .clearButton {
        -webkit-appearance: none;
        width: 90px;
        height: 30px;
        border-radius: 5px;
        border: none;
        background-color: #e5e5e5;
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        color: #000;
        font-size: 14px;
        margin-top: -15px;
    }

    #result {
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        font-size: 30px;
        margin-top: 33px;
        text-align: center;
    }
}

/* Viewport size for laptops */
@media (min-width: 1280px) {
    body {
        height: 100vh;
        display: flex;
        flex-direction: column;
        align-items: center;
        background-color: #f4f4f4;
    }

    .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 50px;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        height: 550px;
        width: 650px;
        border-radius: 15px;
    }

    label {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 40px;
        font-weight: bold;
    }

    input {
        -webkit-appearance: none;
        padding: 10px;
        border-radius: 10px;
        border: none;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        background-color: #fff;
        height: 70px;
        width: 500px;
        color: #000;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 30px;
        font-weight: bold;
        font-style: italic;
        text-align: center;
    }

    .input-container {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    h1 {
        text-align: center;
        font-family:Verdana, Geneva, Tahoma, sans-serif;
        font-style: italic;
        font-size: 50px ;
        margin-top: 50px;
        margin-bottom: 30px;
    }

    .calculateButton {
        -webkit-appearance: none;
        margin-top: -10px;
        width: 300px;
        height: 70px;
        border-radius: 15px;
        border: none;
        background-color: rgb(194, 233, 255);
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        font-size: 30px;
        letter-spacing: 1.5px;
        color: #000;
        transition: 0.3s;
    }

    .calculateButton:hover {
        cursor: pointer;
        background-color: rgb(168, 221, 252);
        transition: 0.3s;
    }
    
    .calculateButton:active {
        background-color: rgb(123, 188, 226);
    }

    .clearButton {
        -webkit-appearance: none;
        width: 120px;
        height: 40px;
        border-radius: 8px;
        border: none;
        background-color: #e5e5e5;
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        color: #000;
        font-size: 16px;
        margin-top: -35px;
        transition: 0.3s;
    }

    .clearButton:hover {
        cursor: pointer;
        background-color: #d3d3d3;
        transition: 0.3s;
    }

    .clearButton:active {
        background-color: #b3b3b3;
    }

    #result {
        font-family: Arial, Helvetica, sans-serif;
        font-weight: bold;
        font-size: 35px;
        margin-top: 50px;
        text-align: center;
    }
}