body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f5f5f5;
}

.calculator {
    background-color: #f0f0f0;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    text-align: center;
    max-width: 400px;
    margin: auto;
}

.logo img {
    width: 100px;
    height: auto;
    margin-bottom: 20px;
}

#display {
    width: calc(100% - 20px);
    margin: 0 auto 20px;
    padding: 10px;
    font-size: 1.5em;
    border: none;
    border-radius: 5px;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
}

button {
    padding: 15px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: #007bff;
    color: #fff;
}

button:hover {
    background-color: #0056b3;
}

.button1 {
    padding: 15px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: #a600ff;
    color: #fff;
}

.button1:hover {
    background-color: #9500b3;
}

.mode-selector{
    display: flex;
    justify-content: center;
    margin-top: 5%;
}

.dwnld{
    text-align: center;
    margin: 10%;
}

.dwnld a {
    text-decoration: none;
    color: grey;
}

.dwnld a:hover{
    cursor: pointer;
    color: black;
}